WO2013164703A9

WO2013164703A9 - Plants having enhanced yield-related traits and method for making same

Info

Publication number: WO2013164703A9
Application number: PCT/IB2013/052021
Authority: WO
Inventors: Steven Vandenabeele
Original assignee: Basf Plant Science Company Gmbh; Basf Schweiz Ag; Basf (China) Company Limited
Priority date: 2012-05-04
Filing date: 2013-03-14
Publication date: 2014-02-27
Also published as: EP2844758A1; WO2013164703A1; US20150232873A1; CN104583407A; BR102013006244A2; AR094431A1; EP2844758A4; CA2871055A1

Abstract

A method for enhancing various economically important yield-related traits in plants by modulating expression in a plant of a nucleic acid encoding a PMP (protein of interest) polypeptide. Plants having modulated expression of a nucleic acid encoding a PMP polypeptide, which plants have one or more enhanced yield-related traits compared with control plants are provided. Unknown PMP-encoding nucleic acids and constructs comprising the same, which is useful in performing the methods of the invention, are also provided.

Description

PLANTS HAVING ENHANCED YIELD-RELATED TRAITS AND METHOD FOR MAKING SAME

The present application claims priority of the following applications: EP 12 166 838.8 filed on May 4, 2012, US 61/642481 filed on May 4, 2012 all of which are herewith incorporated by reference with respect to the entire disclosure content.

Background

The present invention relates generally to the field of molecular biology and concerns a method for enhancing one or more yield-related traits in plants by modulating expression in a plant of a nucleic acid encoding a POI (Protein Of Interest) polypeptide. The present invention also concerns plants having modulated expression of a nucleic acid encoding a POI polypeptide, which plants have one or more one or more enhanced yield-related traits relative to corresponding wild type plants or other control plants. The invention also provides constructs useful in the methods, uses, plants, harvestable parts and products of the invention of the invention.

The ever-increasing world population and the dwindling supply of arable land available for agriculture fuels research towards increasing the efficiency of agriculture. Conventional means for crop and horticultural improvements utilise selective breeding techniques to identify plants having desirable characteristics. However, such selective breeding techniques have several drawbacks, namely that these techniques are typically labour intensive and result in plants that often contain heterogeneous genetic components that may not always result in the desirable trait being passed on from parent plants. Advances in molecular biol- ogy have allowed mankind to modify the germplasm of animals and plants. Genetic engineering of plants entails the isolation and manipulation of genetic material (typically in the form of DNA or RNA) and the subsequent introduction of that genetic material into a plant. Such technology has the capacity to deliver crops or plants having various improved economic, agronomic or horticultural traits.

A trait of economic interest is increased yield. Yield is normally defined as the measurable produce of economic value from a crop. This may be defined in terms of quantity and/or quality. Yield is directly dependent on several factors, for example, the number and size of the organs, plant architecture (for example, the number of branches), seed production, leaf senescence and more. Root development, nutrient uptake, stress tolerance and early vigour may also be important factors in determining yield. Optimizing the abovementioned factors may therefore contribute to increasing crop yield.

Seed yield is an important trait, since the seeds of many plants are important for human and animal nutrition. Crops such as corn, rice, wheat, canola and soybean account for over half the total human caloric intake, whether through direct consumption of the seeds themselves or through consumption of meat products raised on processed seeds. They are also a source of sugars, oils and many kinds of metabolites used in industrial processes. Seeds contain an embryo (the source of new shoots and roots) and an endosperm (the source of nutrients for embryo growth during germination and during early growth of seedlings). The development of a seed involves many genes, and requires the transfer of metabolites from the roots, leaves and stems into the growing seed. The endosperm, in particular, assimilates the metabolic precursors of carbohydrates, oils and proteins and synthesizes them into storage macromolecules to fill out the grain.

Another important trait for many crops is early vigour. Improving early vigour is an important objective of modern rice breeding programs in both temperate and tropical rice cultivars. Long roots are important for proper soil anchorage in water-seeded rice. Where rice is sown directly into flooded fields, and where plants must emerge rapidly through water, longer shoots are associated with vigour. Where drill-seeding is practiced, longer mesocotyls and coleoptiles are important for good seedling emergence. The ability to engineer early vigour into plants would be of great importance in agriculture. For example, poor early vigour has been a limitation to the introduction of maize (Zea mays L.) hybrids based on Corn Belt germplasm in the European Atlantic.

A further important trait is that of improved abiotic stress tolerance. Abiotic stress is a prima- ry cause of crop loss worldwide, reducing average yields for most major crop plants by more than 50% (Wang et al., Planta 218, 1 -14, 2003). Abiotic stresses may be caused by drought, salinity, nutrient deficiency, extremes of temperature, chemical toxicity and oxidative stress. The ability to improve plant tolerance to abiotic stress would be of great economic advantage to farmers worldwide and would allow for the cultivation of crops during adverse conditions and in territories where cultivation of crops may not otherwise be possible.

Crop yield may therefore be increased by optimising one of the above-mentioned factors. Depending on the end use, the modification of certain yield traits may be favoured over others. For example for applications such as forage or wood production, or bio-fuel resource, an increase in the vegetative parts of a plant may be desirable, and for applications such as flour, starch or oil production, an increase in seed parameters may be particularly desirable. Even amongst the seed parameters, some may be favoured over others, depending on the application. Various mechanisms may contribute to increasing seed yield, whether that is in the form of increased seed size or increased seed number.

Plant cells contain amongst their organelles plastids, and these are not fixed in their intracellular distribution. For many years unequal distribution of plastids within a cell in response to external stimuli has been known and a role of plastid movement in blue light reaction and to different light intensities has been described. Knockout mutants with altered plastid movement ability have been disclosed in a few plants. The area of plastid movement is summarized in the publication of a doctorate thesis by Serena Schmidt von Braun („Chup1 - a chloroplast movement protein and its interactions." PhD thesis, Serena Schmidt von Braun (2008) Fakultat fur Biologie der Ludwig-Maximilians-Universitat Munchen, Munich, Germany; http://edoc.ub.uni-muenchen.de/8745/1/Schmidt_von_Braun_Serena.pdf)

It has now been found that various yield-related traits may be improved in plants by modulating expression in a plant of a nucleic acid encoding a POI (Protein Of Interest) polypeptide in a plant. Brief summary of the invention

The present invention concerns a method for enhancing one or more yield-related traits in plants by increasing the expression in a plant of a nucleic acid encoding a POI polypeptide. The present invention also concerns plants having increased expression of a nucleic acid encoding a POI polypeptide, which plants have one or more enhanced yield-related traits compared with control plants. The invention also provides hitherto unknown POI polypeptides, POI nucleic acids and constructs comprising POI-encoding nucleic acids, useful in performing the methods of the invention. A preferred embodiment is a method for enhancing one or more yield-related traits in a plant relative to control plants, comprising the steps of increasing the expression, preferably by recombinant methods, in a plant of a nucleic acid encoding a polypeptide comprising PFAM domain PF10358 and growing the plant(s), wherein the PFAM domain PF10358 is detectable in the polypeptide sequence using InterPro scan (see Zdobnov E.M. and Ap- weiler R.; "InterProScan - an integration platform for the signature-recognition methods in InterPro."; Bioinformatics, 2001 , 17(9): 847-8; InterPro database, Release 37.0, 30 April, 2012) and preferably wherein the nucleic acid is exogenous to the plant and / or the expression is under the control of a promoter sequence operably linked to the nucleic acid encoding the polypeptide, and growing the plant. These inventive methods comprise in- creasing the expression in a plant of a nucleic acid encoding a POI polypeptide and thereby enhancing one or more yield-related traits of said plant compared to the control plant. The term "thereby enhancing" is to be understood to include direct effects of increasing the expression of the POI polypeptide as well as indirect effects as long as the increased expression of the POI polypeptide encoding nucleic acid results in an enhancement of at least one of the yield related traits. For example overexpression of a transcription factor A may increase transcription of another transcription factor B that in turn controls the expression of a number of genes of a given pathway leading to enhanced biomass or seed yield. Although transcription factor A does not directly enhance the expression of the genes of the pathway leading to enhanced yield-related traits, increased expression of A is the cause for the ef- feet of enhanced yield related-trait(s).

Hence, it is an object of the invention to provide an expression cassette and a vector con- struct comprising a nucleic acid encoding a POI polypeptide, operably linked to a beneficial promoter sequence. The use of such genetic constructs for making a transgenic plant having one or more enhanced yield-related traits, preferably increased biomass, relative to control plants is provided.

Also a preferred embodiment are transgenic plants transformed with one or more expression cassettes of the invention, and thus, expressing in a particular way the nucleic acids encoding a POI protein, wherein the plants have one or more enhanced yield-related trait. Harvestable parts of the transgenic plants of the present invention and products derived from the transgenic plants and their harvestable parts are also part of the present invention.

Detailed description of the invention

The present invention shows that increasing expression in a plant of a nucleic acid encod- ing a POI polypeptide gives plants having one or more enhanced yield-related traits relative to control plants.

According to a first embodiment, the present invention provides a method for enhancing one or more yield-related traits in plants relative to control plants, comprising increasing expression in a plant of a nucleic acid encoding a POI polypeptide and optionally selecting for plants having one or more enhanced yield-related traits. According to another embodiment, the present invention provides a method for producing plants having one or more enhanced yield-related traits relative to control plants, wherein said method comprises the steps of increasing expression in said plant of a nucleic acid encoding a POI polypeptide as described herein and optionally selecting for plants having one or more enhanced yield- related traits.

A preferred method for increasing expression of a nucleic acid encoding a POI polypeptide is by introducing and expressing in a plant a nucleic acid encoding a POI polypeptide.

Any reference hereinafter to a "protein useful in the methods of the invention" is taken to mean a POI polypeptide as defined herein. Any reference hereinafter to a "nucleic acid useful in the methods of the invention" is taken to mean a nucleic acid capable of encoding such a POI polypeptide. In one embodiment any reference to a protein or nucleic acid "use- ful in the methods of the invention" is to be understood to mean proteins or nucleic acids "useful in the methods, constructs, plants, harvestable parts and products of the invention". The nucleic acid to be introduced into a plant (and therefore useful in performing the methods of the invention) is any nucleic acid encoding the type of protein which will now be described, hereafter also named "POI nucleic acid" or "POI gene".

Throughout this application the terms "protein of interest" (short: "POI") and "plastid movement protein" (short: "PMP") are used interchangeably. In one embodiment, A "POI polypeptide" as defined herein refers to any polypeptide involved in and / or responsible for plastid movement. In a preferred embodiment the plastid movement protein (PMP) is a protein that - when the presence or activity of the PMP protein is decreased or disrupted - leads to altered or malfunctioning plastid movement in response to common stimuli that normally cause plastid movement within the plant cell, for example a plant cell in which the presence or activity of the PMP protein is unchanged.

In one embodiment the PMP polypeptide comprises

1 ) all of the following motifs:

Motif 1 (SEQ ID NO: 34):

[M/V/I][P/A/G/S][L/I/M/T][D/E][E/D][L/M/V][L/I/V/M]GKT[A/G]E[Q/H][I/V]AFEG[I/M][A /V][S/T/N]A[I/V]I[Q/S/L][G/A]R[N/S][K/A][E/D/A][G/R/V/L][G/V]A[S/T/N][S/T][S/T]AA[ R/Q/E][T/I/S/A][I/V][AST];

Motif 2 (SEQ ID NO: 36):

[V/N/I/C][Y/F][L/I/V][S/P][E/D]LGKG[L/I][G/S][C/P][V/L/I][V/I][Q/R]T[R/K][D/N]GG[Y/

F] L[A/V/T][A/S][T/M/L]NP[L/F][D/N][T/I/V/N][I/A/V/L/P][V/M][S/A/T/M/G/E][R/K][K/N][ D/E][T/A/L]PKL[A/V]MQ[L/I/M]S[K/R][P/A/Q][L/F/Y/I/M/V][V/I/L][L/V/F];

Motif 3 (SEQ ID NO: 37):

[S/K/E/L/V][K/E/S/A][G/D/E/S]QQ[K/Q/P/E/H/N][D/E][L/V/M/I/F/Q]LWS[I/L/M]SSR[I/ V][M/V]ADMWL[K/R][P/T/S/H][M/I/L]RNPD[V/I][K/N/I]; Motif 4(SEQ ID NO: 40):

M[A/G/S][T/N/S/V][A/I/G][M/T/L/I][S/N/T][T/S/D/Y][G/S]R[K/Q/N][E/D]RI[S/T/A/M/D][ T/S]G[I/L]WN[V/M/I/A][N/D/E/S/H/Q][E/D][N/T/E/D/S]P[L/V/F]TS[A/V/G/S][E/D][E/K/ N][V/I/L]L[A/S][F/V/C/I][S/T/A][L/M/T]QK[I/V/L/M]E[V/A/S/F/T]M[A/V/T][I/V][E/K][A/G ]LK[I/V]Q[A/V][E/D/G][I/M/V][A/V/S/T][E/D/K][E/D];

Motif 5 (SEQ ID NO: 42):

[V/L/A/F][V/T][V/I/A]Q[L/M]RDP[I/L/M/T]R[R/Q][Y/F]E[A/S/E]VG[G/A][P/T][V/M/L/S][ V/M/I][A/V][V/L/I][V/L/I][H/Q]A[T/V/E]; Motif A (SEQ ID NO: 43):

M[Q/H/N][K/R][L/M][S/G]CLFSVEVV[A/T/I][V/A][Q/E][G/N/D]LP[A/S]SMNGLRL[S/A/

G] V[C/A/S]VRKKET[K/R][D/E]G[A/S][V/M][N/Q/H/K]TMP[S/C]RV[S/D/A/H][Q/L/H]G [A/S/G][G/A]DFEET[L/M]F[I/V/L][K/R][C/S][H/N][V/L/A]Y; and

Motif B (SEQ ID NO: 44): [K/R/T]FE[Q/P/A/S]R[P/V/L]F[F/W/M/S/L][I/L/V/F][Y/S][V/L/A][F/V][A/S]V[D/E]A[E/D/ K/Q/P][A/E]L[D/E/S][F/L]GR[T/S/H/N][S/Y/I/L/A]VDLS[E/Q/L/R]L[I/V][Q/K/R]ES[I/V/ M/T/S][E/D/G][K/R]M[S/N][Q/A/Y][E/Q][G/D][T/L/A/M/E]R[V/L]RQWD[T/M/R][S/N/A] [F/W/L][S/N/G/P/K]L[S/A]GKAKGGEL[V/A/I][L/V]KL[G/S/A]FQIM[E/D][K/D][E/D/G]G [G/V][l/V/A/G]; or

2) any 6 of the motifs listed under 1); or

3) any 5 of the motifs listed under 1); or

4) any 4 of the motifs listed under 1); or

5) any 3 of the motifs listed under 1); or

6) Motifs 1 , 2, 3, 4 and 5 as described herein above; or

7) Motifs A and B as described herein above; or

8) any 4 of the motifs 1 , 2, 3, 4 and 5 as described herein above; or

9) Motifs 1 , 2 and 3 as described herein above; or

10) Motifs 4 and 5 as described herein above; or

1 1 ) A combinations of 7) and 8) or 7) and 9) or 7) and 10) above.

In one embodiment the order of the motifs within the amino acid sequence of the PMP pol- ypeptide when looking from N-terminus to C-terminus is Motif 2, 1 , 4, 5 and last 3, wherein Motif 2 does not need to be at the N-terminal position, but typically is found within the protein at some distance from the N-terminus.

In one embodiment the order of the motifs within the amino acid sequence of the PMP polypeptide when looking from N-terminus to C-terminus is Motif A, B, 2, 1 , 4, 5 and last 3, wherein Motif A does not need to be at the N-terminal position, but typically is found within the protein at some distance from the N-terminus.

In one embodiment the end of Motif 3 is found within 20, 15, 10 or 5 amino acid positions from the C-terminal end, or the end of Motif 3 is also the C-terminal end.

In a preferred embodiment the Motifs 2, 1 , 4, 5 and 3, preferably in this order, more prefer- ably at least motifs 2, 1 and 3, even more preferably in this order are found in the C-terminal half of the PMP protein. In another preferred embodiment the motifs A and B are found in the N-terminal half of the PMP protein, preferably in this order (A before B).

In a preferred embodiment in any of the embodiments disclosed herein Motif 1 may be re- placed by Motif 1 a (SEQ ID NO: 35), wherein Motif 1 a is identical to Motif 1 with the exception that position 32 of motif 1 (i.e. [G/V]) is deleted (and hence position 32 in Motif 1 a has Alanine and continues like Motif 1 from position 34 onwards) and Motif 1 a has only 41 positions, or by Motif 1 ^* as disclosed in SEQ ID NO: 46, preferably by Motif 1^* (SEQ ID NO: 46):

[M/V/I][P/A][L/I/M/T][D/E][E/D][L/M/V][L/I/V/M]GKT[A/G]EQ[I/V]AFEG[I][A/V][S/T]A[I/V]I[Q/S] [G/A] RN K[E/D]G A[S/T] [S/T] [S/T] AAR[T/I/S] [l/V] [A/S/T] In a preferred embodiment in any of the embodiments disclosed herein Motif 2 may be replaced by Motif 2^* as disclosed in SEQ ID NO: 47:

[V/N][Y/F][L/I/V][S/P][E/D]LGKG[L/I]GCV[V/I]QT[R/K]DGGYL[A/V/T][A/S][T/M]NP[L/F][D/N][ T/I/V/N][I/A/V/L/P][V/M][S/A/T]RK[D/E]TPKLAMQ[L/I/M]S[K/R]P[L/F/Y]V[L/V].

In a preferred embodiment in any of the embodiments disclosed herein Motif 3 may be replaced by Motif 3a (SEQ ID NO: 38), wherein Motif 3a is identical to Motif 3 with the exception that position 5 of motif 3 (i.e. Q) is deleted (and hence position 5 in Motif 3a is either amino acid of K, Q, P, E, H or N and continues like Motif 3 from position 7 onwards) and Motif 3a has only 30 positions, or by Motif 3b (SEQ ID NO: 39), wherein Motif 3b is identical to Motif 3 with the exception that positions 4 and 5 of motif 3 (i.e. QQ) are deleted (and hence position 4 in Motif 3b is either of K/Q/P/E/H/N and continues like Motif 3 from position 7 onwards) and Motif 3b has only 29 positions, or by Motif 3^* as disclosed in SEQ ID NO: 48, preferably by Motif 3^*(SEQ ID NO: 48):

[S/K/E/L/V]K[G/D/E/S][K/Q/P/E/H/N][D/E][L/V/M/I]LWS[I/L/M]SSR[I/V][M/V]ADMWLK[P/T/S] [M/I]RNPD[V/I][K/N].

In a preferred embodiment in any of the embodiments disclosed herein Motif 4 may be replaced by Motif 4a (SEQ ID NO: 41 ), wherein Motif 4a is identical to Motif 4 with the exception that position 27 of motif 4 (i.e. S) is deleted (and hence position 27 in Motif 4a has ei- ther A,V,G or S as amino acid and continues like Motif 4 from position 29 onwards) and Motif 4a has only 55 positions, or by Motif 4^* as disclosed in SEQ ID NO: 49, preferably by Motif 4* (SEQ ID NO: 49):

M[A/G/S][T/N/S]AM[S/N/T][T/S][G/S]R[K/Q][E/D]RI[S/T/A][T/S]G[I/L]WNV[N/D/E][E/D][N/T/E /D]P[L/V]T[A/V][E/D][E/K][V/I/L]LAF[S/T/A][L/M]QK[I/V/L/M]E[V/A/S/F/T]M[A/V/T][I/V]E[A/G] LK[I/V]Q[A/V][E/D][I/M][A/V][E/D][E/D].

In a preferred embodiment in any of the embodiments disclosed herein Motif 5 may be replaced by Motif 5^* as disclosed in SEQ ID NO: 50:

[V/L/A][V/T]VQ[L/M]RDP[I/L/M]R[R/Q][Y/F]EAVGGP[V/M/L/S][V/M/I][A/V][V/L/I][V/L/I][H/Q]A [T/V/E].

In a preferred embodiment in any of the embodiments disclosed herein Motif A may be replaced by Motif A^* as disclosed in SEQ ID NO: 51 :

M[Q/H]KL[S/G]CLFSVEVV[A/T][V/A]QGLP[A/S]SMNGLRL[S/A]VCVRKKET[K/R][D/E]G[A/S

][V/M][N/Q/H/K]TMP[S/C]RV[S/D]QG[A/S][G/A]DFEETLF[I/V/L][K/R]CH[V/L]Y.

In a preferred embodiment in any of the embodiments disclosed herein Motif B may be re- placed by Motif Ba (SEQ ID NO: 45), wherein Motif Ba is identical to Motif B with the exception that position 39 of Motif B (i.e. M) is deleted (and hence position 39 in Motif Ba has S or N and continues like Motif B from position 41 onwards) and Motif Ba has only 78 positions, or by Motif B* as disclosed in SEQ ID NO: 52, preferably by Motif B* (SEQ ID NO: 52): KFE[Q/P]RPF[F/W/M/S/L][I/L/V]Y[V/L][F/V]AV[D/E]A[E/D/K/Q/P][A/E]L[D/E/S][F/L]GR[T/S/H /N][S/Y/I/L/A]VDLS[E/Q/L]L[I/V][Q/K/R]ES[I/V][E/D][K/R]SQ[E/Q]G[T/L/A/M/E]R[V/L]RQWD[ T/M]S[F/W][S/N/G/P]L[S/A]GKAKGGELV[L/V]KLGFQIM[E/D]K[E/D]G[G/V][I/V]. In a more preferred embodiment the amino acid sequence of any one or all of Motif 1 , 2, 3, 4, 5, A or B is exactly the amino acid sequence of the corresponding stretch of SEQ ID NO: 2. In one embodiment the PMP protein of the invention (i.e. POI polypeptide) is an acidic protein, i.e. it has an isoelectric point value (pi) of below 7.0, preferably equal to or less than 6.0, more preferably equal to or less than 5.5 and most preferably equal to or less than 5.2. In a further embodiment the pi value of the PMP polypeptide is above 5.0. Various techniques and tools are available in the art to determine the pi value of a given protein. In one embodiment, the pi value is determined using the Sequence Manipulation Suite (Stothard P (2000) The Sequence Manipulation Suite: JavaScript programs for analyzing and formatting protein and DNA sequences. Biotechniques 28:1 102-1 104).

In a preferred embodiment the PMP polypeptide useful in the methods of the invention has a content of sulphur containing amino acids of equal to or less than 5 % by number, i.e. per 100 amino acids of the PMP polypeptide the number of Methionine and Cysteine residues and any other Sulphur containing amino acid residues like selenocysteine sum up to 5 or less. Preferably the sulphur containing amino acid residues make out less than 4 %. Preferably these may be determined using the Sequence Manipulation Suite (Stothard P (2000) The Sequence Manipulation Suite: JavaScript programs for analyzing and formatting pro- tein and DNA sequences. Biotechniques 28: 1102-1 104)

In a further preferred embodiment the PMP polypeptide useful in the methods of the invention comprises at least 30% by number of amino acids with aliphatic side chain, preferably equal to or more than 31 %, 32 % or even 33%. Preferably these may be determined using the Sequence Manipulation Suite (Stothard P (2000) The Sequence Manipulation Suite: JavaScript programs for analyzing and formatting protein and DNA sequences. Biotechniques 28:1 102-1104)

According one embodiment, there is provided a method for improving yield-related traits as provided herein in plants relative to control plants, comprising increasing expression in a plant of a nucleic acid encoding a PMP polypeptide as defined herein. Preferably said one or more enhanced yield-related traits comprise increased yield relative to control plants, and preferably comprise increased biomass and/or increased seed yield relative to control plants, and preferably comprise increased aboveground biomass, increased below-ground biomass, increased seed yield and/or increased sugar yield (either as harvestable sugar per plant, per fresh weight, per dry weight or per area) relative to control plants.

In one embodiment the nucleic acid sequences employed in the methods, constructs, plants, harvestable parts and products of the invention are

nucleic acid molecule selected from the group consisting of:

(i) a nucleic acid represented by SEQ ID NO: 1 , 3, 5, 7, 9, 11 , 13, 15, 17, 19, 21 , 23, 25,

27, 29, 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 ; preferably SEQ ID NO: 1 , 53, 55, 57,

59, 61 , 63, 65, 67, 69 or 71 , more preferably SEQ ID NO: 1 ; (ii) the complement of a nucleic acid represented by SEQ ID NO: 1 , 3, 5, 7, 9, 11 , 13, 15, 17, 19, 21 , 23, 25, 27, 29, 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 ; preferably SEQ ID NO: 1 , 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 , more preferably SEQ ID NO: 1 ;

(iii) a nucleic acid encoding a PMP polypeptide having in increasing order of preference at least 25%, 30%, 35%, 40%, 45%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%,

59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to the amino acid sequence represented by SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO:

2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2, and additionally or alternatively comprising one or more motifs having in increasing order of preference at least 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, 99% or more sequence identity to any one or more of the motifs given in SEQ ID NO: 34 to SEQ ID NO: 52, preferably to any one or more of the motifs given in

SEQ ID NO: 46 to SEQ ID NO: 52, and further preferably conferring one or more enhanced yield-related traits relative to control plants; and

(iv) a nucleic acid molecule which hybridizes with a nucleic acid molecule of (i) to (iii) under high stringency hybridization conditions and preferably confers one or more en- hanced yield-related traits relative to control plants;

Or encoding a polypeptide selected from the group consisting of:

(i) an amino acid sequence represented by SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2;

(ii) an amino acid sequence having, in increasing order of preference, at least 25%, 30%, 35%, 40%, 45%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to the amino acid sequence represented by SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28,

30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2, and additionally or alternatively comprising one or more motifs having in increasing order of preference at least 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, 99% or more sequence identity to any one or more of the motifs given in in SEQ ID NO: 34 to

SEQ ID NO: 52, preferably to any one or more of the motifs given in SEQ ID NO: 46 to SEQ ID NO: 52, and further preferably conferring one or more enhanced yield-related traits relative to control plants; and

(iii) derivatives of any of the amino acid sequences given in (i) or (ii) above.

In one embodiment the PMP useful in the methods of the invention comprises a PFAM domain PF10358 (N-terminal€2 in EEIG1 and EHBP1 proteins) when analyzed with the InterPro scan software (see Zdobnov E.M. and Apweiler R.; "InterProScan - an integration platform for the signature-recognition methods in InterPro."; Bioinformatics, 2001 , 17(9): 847-8; InterPro database, release 37.0, 30 April, 2012) (Bateman et al., Nucleic Acids Research 30(1): 276-280 (2002) ) & The Pfam protein families database: R.D. Finn, J. Mistry, J. Tate, P. Coggill, A. Heger, J.E. Pollington, O.L. Gavin, P. Gunesekaran, G. Ceric, K. For- slund, L. Holm, E.L. Sonnhammer, S.R. Eddy, A. Bateman Nucleic Acids Research (2010) Database Issue 38:21 1 -222).

Preferably the polypeptide comprises one or more motifs or domains as defined elsewhere herein.

In one embodiment the PMP useful in the methods of the invention contains a transit peptide for plastid targeting and is targeted to chloroplast when expressed in plant cells. Motifs 1 to 3 were derived in a two-step process using the MEME algorithm (Bailey and Elkan, Proceedings of the Second International Conference on Intelligent Systems for Molecular Biology, pp. 28-36, AAAI Press, Menlo Park, California, 1994). At each position within a MEME motif, the residues are shown that are present in the query set of sequences with a frequency higher than 0.2. Afterwards, the motif sequence was manually edited.

Motif 4, 5, A, B, 1a, 3a, 3b, 4a, Ba, 1^*, 2^*, 3^*, 4^*, 5^*, A^* and B^* were created manually from sequence alignments.

Residues within square brackets represent alternatives.

In one embodiment, the PMP polypeptide as used herein comprises at least one of the mo- tifs 1 , 2, 3, 4 or 5 as defined herein above.

In a further embodiment, the PMP polypeptide as used herein comprises at least one of the motifs represented by Group A :

Group A

Motif A, Motif B or Motif Ba, or alternatively the more limited motifs A^* and B^*

In another embodiment, the PMP polypeptide comprises at least one of the motifs represented by Group B:

Group B

Motif 1 , 2 ,3 , 4 or 5, or alternatively the more limited motifs 1 a, 2, 3a or 3b, 4a, 5, or the even more limited motifs 1^*, 2^*, 3^*, 4^* or 5^*.

In yet another embodiment, the PMP polypeptide as used herein comprises at least on motif of Group A and at least one motif of Group B as defined herein. In still another embodiment, the PMP polypeptide comprises in increasing order of preference, at least 2, at least 3, at least 4, at least 5, at least 6, at least 7, at least 8, at least 9, at least 10, at least 1 1 , at least 12, at least 13 or all 14 motifs selected from the group consist- ing of the motifs 1a, 2, 3b, 4a, 5, A, Ba, 1 ^*, 2^*, 3^*, 4^*, 5^*, A^* and B^* as defined herein above. In one preferred embodiment, the PMP polypeptide comprises one or more motifs selected from Motif 1 ^*, Motif 2^*, Motif 3^*, Motif 4^* and Motif 5^*. Preferably, the PMP polypeptide comprises Motifs 1 ^* and 2^*, or Motifs 2^* and 3^*, or Motifs 1 ^* and 3^*, or Motifs 1 ^*, 2^* and 3^*. In another preferred embodiment the PMP polypeptide comprises Motif 3^* and motif 4^*, or motif 3^* and motif 5^*, or all motifs 3^*, 4^* and 5^*. In an even more preferred embodiment the PMP polypeptide comprises Motifs 1 ^*, 2^*, 4^* and 5^* and preferably also Motif 3^*. In one embodiment the PMP polypeptide comprises Motifs 1 ^*, 2^*, 3^*, 4^*, 5^*, A^* and B^* and in addition the PFAM domain PF10358 (the latter detected using the InterproScan software as described in example 4).

Additionally or alternatively, the PMP protein has in increasing order of preference at least 25%, 26%, 27%, 28%, 29%, 30%, 31 %, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41 %, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% overall sequence identity to the amino acid sequence represented by SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2, provided that the homologous protein comprises any one or more of the conserved motifs as outlined above. The overall sequence identity is determined using a global alignment algorithm, such as the Needleman Wunsch algorithm in the program GAP (GCG Wisconsin Package, Accelrys), preferably with default parameters and preferably with sequences of mature proteins (i.e. without taking into account secretion signals or transit peptides). In one embodiment the sequence identity level is determined by comparison of the polypeptide sequences over the entire length of the sequence of SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2. Alternatively the sequence identity is determined by comparison of a nucleic acid sequence to the sequence encoding the mature protein in SEQ ID NO: 1 , 3, 5, 7, 9, 1 1 , 13, 15, 17, 19, 21 , 23, 25, 27, 29, 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 ; preferably SEQ ID NO: 1 , 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 , more preferably SEQ ID NO: 1. In another embodiment the sequence identity level of a nucleic acid sequence is determined by comparison of the nucleic acid sequence over the entire length of the coding sequence of the sequence of SEQ ID NO: 1 , 3, 5, 7, 9, 11 , 13, 15, 17, 19, 21 , 23, 25, 27, 29, 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 ; preferably SEQ ID NO: 1 , 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 , more preferably SEQ ID NO: 1. In another embodiment, the sequence identity level is determined by comparison of one or more conserved domains or motifs in SEQ ID NO: 2 with corresponding conserved domains or motifs in other PMP polypeptides. Compared to overall sequence identity, the sequence identity will generally be higher when only conserved domains or motifs are considered. Preferably the motifs in a PMP polypeptide have, in increasing order of preference, at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% se- quence identity to any one or more of the conserved domains or motifs represented by SEQ ID NO: 34 to SEQ ID NO: 52, preferably to any one or more of the motifs given in SEQ ID NO: 46 to SEQ ID NO: 52). In other words, in another embodiment a method for enhancing one or more yield-related traits in plants is provided wherein said PMP polypeptide comprises a conserved domain (or motif) with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to the motifs starting with amino acid of SEQ ID NO:2 as shown in figure 1 and up to the amino acid shown in figure 1 .

The terms "domain", "signature" and "motif" are defined in the "definitions" section herein.

In one embodiment the PMP polypeptide has a Valine at position 20 of Motif 1 , 1 a or 1 *, or at the position 601 in the amino acid sequence or as the first amino acid following the amino acid sequence Alanine, Phenylalanine, Glutamic acid, Glycine and Isoleucine, or the counterpart to position 601 of SEQ ID NO: 2 in a global alignment of the PMP polypeptide with SEQ ID NO: 2.

In one embodiment the PMP polypeptide has a Alanine at position 18 of Motif B, Ba or B*, or at the position 219 in the amino acid sequence or as the first amino acid following the amino acid sequence Phenylalanine, Alanine, Valine, Aspartic acid, Alanine and Glutamic acid, or the counterpart to position 219 of SEQ ID NO: 2 in a global alignment of the PMP polypeptide with SEQ ID NO: 2.

In one embodiment the PMP polypeptide has a Glycine at position 392 in the amino acid sequence or as the first amino acid following the amino acid sequence Glu-Asp-Ser-Gly- Asp-Gly, or the counterpart to position 392 of SEQ ID NO: 2 in a global alignment of the PMP polypeptide with SEQ ID NO: 2.

In one embodiment the PMP polypeptide has an Arginine at position 781 in the amino acid sequence or as the first amino acid following the amino acid sequence E-E-K-K-F-K-V-T-S- L, or the counterpart to position 781 of SEQ ID NO: 2 in a global alignment of the PMP polypeptide with SEQ ID NO: 2. In a preferred embodiment the PMP polypeptide comprises amino acid stretches of SEQ ID NO: 2 selected from the group consisting of:

1. positions 127 to 192 of SEQ ID NO: 2;

2. Positions 202 to 279 of SEQ ID NO: 2;

3. Positions 502 to 551 of SEQ ID NO: 2;

4. Positions 582 to 622 of SEQ ID NO: 2;

5. Positions 627 to 681 of SEQ ID NO: 2;

6. Positions 737 to 762 of SEQ ID NO: 2; 7. Positions 826 to 854 of SEQ ID NO: 2; and

8. All of the stretches listed under 1. To 7 above;

Wherein the order of the amino acid stretches in the PMP polypeptide may or may not be the same as their order in SEQ ID NO: 2. Preferably the stretches shown under 1. and 2. Above are found in the N-terminal half of the PMP polypeptide, and the stretches shown under 3. to 7. above are found in the C-terminal half of the PMP polypeptide.

Preferably, the polypeptide sequence which when used in the construction of a phylogenet- ic tree, such as the one depicted in Figure 3, clusters with the group of PMP polypeptides comprising the amino acid sequence represented by SEQ ID NO: 2 rather than with any other group.

In another embodiment the polypeptides of the invention when used in the construction of a phylogenetic tree, such as the one depicted in Figure 3 cluster not more than 4, 3, or 2 hierarchical branch points away from the amino acid sequence of SEQ ID NO: 2.

Furthermore, PMP polypeptides (at least in their native form) typically are involved in the plastid movement within a plant cell, including plastid and stromules movement. Methods to measure such movements are known in the art, for example from the work of Kwok and Hanson ("Microfilaments and microtubules control the morphology and movement of non- green plastids and stromules in Nicotiana tabacum"; Kwok EY & Hanson MR; Plant Journal (2003) Volume: 35, Issue: 1 , Pages: 16-26).

In addition, nucleic acids encoding PMP polypeptides, when expressed in rice according to the methods of the present invention as outlined in Examples 7 and 10, give plants having increased yield related traits, in particular biomass yield and seed yield, such as above- ground biomass, belowground biomass, seed number and/or seed size. Another function of the nucleic acid sequences encoding PMP polypeptides is to confer information for synthesis of the PMP protein that increases yield or yield related traits as described herein, when such a nucleic acid sequence of the invention is transcribed and translated in a living plant cell.

The present invention is illustrated by transforming plants with the nucleic acid sequence represented by SEQ ID NO: 1 , encoding the polypeptide sequence of SEQ ID NO: 2. However, performance of the invention is not restricted to these sequences; the methods of the invention may advantageously be performed using any PMP-encoding nucleic acid or PMP polypeptide as defined herein. The term "PMP" or "PMP polypeptide" as used herein also intends to include homologues as defined hereunder of SEQ ID NO: 2.

Examples of nucleic acids encoding PMP polypeptides are given in Table A of the Examples section herein. Such nucleic acids are useful in performing the methods of the inven- tion. The amino acid sequences given in Table A of the Examples section are example sequences of orthologues and paralogues of the PMP polypeptide represented by SEQ ID NO: 2, the terms "orthologues" and "paralogues" being as defined herein. Further orthologues and paralogues may readily be identified by performing a so-called reciprocal blast search as described in the definitions section; where the query sequence is SEQ ID NO: 1 , 3, 5, 7, 9, 11 , 13, 15, 17, 19, 21 , 23, 25, 27, 29, 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 ; preferably SEQ ID NO: 1 ; or SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2; the second

BLAST (back-BLAST) would be against plant sequences, preferably higher plant sequences, more preferably Saliceae sequences, and even more preferably poplar sequences.

The invention also provides PMP-encoding nucleic acids and PMP polypeptides useful in the methods, constructs, plants, harvestable parts and products of the invention are those sequences. According to a further embodiment of the present invention, there is therefore provided an isolated nucleic acid molecule selected from the group consisting of:

(i) a nucleic acid represented by SEQ ID NO: 1 , 3, 5, 7, 9, 11 , 13, 15, 17, 19, 21 , 23, 25, 27, 29, 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 ; preferably SEQ ID NO: 1 , 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 , more preferably SEQ ID NO: 1 ;

(ii) the complement of a nucleic acid represented by SEQ ID NO: 1 , 3, 5, 7, 9, 11 , 13, 15, 17, 19, 21 , 23, 25, 27, 29, 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 ; preferably SEQ ID NO: 1 , 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 , more preferably SEQ ID NO: 1 ;

SEQ ID NO: 46 to SEQ ID NO: 52, and further preferably comprising the PFAM domain PF10358and even more preferably conferring one or more enhanced yield- related traits relative to control plants; and

(iv) a nucleic acid molecule which hybridizes with a nucleic acid molecule of (i) to (iii) un- der high stringency hybridization conditions and preferably confers one or more enhanced yield-related traits relative to control plants.

According to a further embodiment of the present invention, there is also provided an isolated polypeptide selected from the group consisting of:

(i) an amino acid sequence represented by SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2; (ii) an amino acid sequence having, in increasing order of preference, at least 25%, 30%, 35%, 40%, 45%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to the amino acid sequence represented by SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, 54, 56, 58, 60,

62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2, and additionally or alternatively comprising one or more motifs having in increasing order of preference at least 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, 99% or more sequence identity to any one or more of the motifs given in SEQ ID NO: 34 to SEQ ID NO: 52, preferably to any one or more of the motifs given in SEQ ID NO: 46 to SEQ ID NO: 52, and further preferably comprising the PFAM domain PF10358 and even more preferably conferring one or more enhanced yield-related traits relative to control plants; and

According to a further embodiment of the present invention, there is therefore provided an isolated nucleic acid molecule selected from the group consisting of:

(i) a nucleic acid represented SEQ ID NO: 1 , 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 , preferably SEQ ID NO: 1 ;

(ii) the complement of a nucleic acid represented by SEQ ID NO: 1 , 53, 55, 57, 59, 61 ,

63, 65, 67, 69 or 71 , preferably SEQ ID NO: 1 ;

(iii) a nucleic acid encoding the polypeptide as represented by preferably SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2, preferably as a result of the degeneracy of the genetic code, said isolated nucleic acid can be derived from a polypeptide sequence as represented by (any one of) preferably SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2and further preferably confers one or more enhanced yield-related traits relative to control plants;

(iv) a nucleic acid having, in increasing order of preference at least 30 %, 31 %, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41 %, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%,

93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity the nucleic acid sequence of SEQ ID NO: 1 , 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 , preferably SEQ ID NO: 1 , and further preferably conferring one or more enhanced yield-related traits relative to control plants; and

(v) a nucleic acid encoding a PMP polypeptide having, in increasing order of preference, at least 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to the amino acid sequence represented by (any one of) SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2and preferably conferring one or more enhanced yield- related traits relative to control plants.

(i) an amino acid sequence represented by (any one of) SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2;

(ii) an amino acid sequence having, in increasing order of preference, at least 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to the amino acid sequence represented by (any one of) SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, and preferably conferring one or more enhanced yield-related traits relative to control plants. Nucleic acid variants may also be useful in practising the methods of the invention. Examples of such variants include nucleic acids encoding homologues and derivatives of any one of the amino acid sequences given in Table A of the Examples section, the terms "homo- logue" and "derivative" being as defined herein. Also useful in the methods, constructs, plants, harvestable parts and products of the invention are nucleic acids encoding homo- logues and derivatives of orthologues or paralogues of any one of the amino acid sequences given in Table A of the Examples section. Homologues and derivatives useful in the methods of the present invention have substantially the same biological and functional activity as the unmodified protein from which they are derived. Further variants useful in practising the methods of the invention are variants in which codon usage is optimised or in which miRNA target sites are removed.

Further nucleic acid variants useful in practising the methods of the invention include portions of nucleic acids encoding PMP polypeptides, nucleic acids hybridising to nucleic acids encoding PMP polypeptides, splice variants of nucleic acids encoding PMP polypeptides, allelic variants of nucleic acids encoding PMP polypeptides and variants of nucleic acids encoding PMP polypeptides obtained by gene shuffling. The terms hybridising sequence, splice variant, allelic variant and gene shuffling are as described herein.

Nucleic acids encoding PMP polypeptides need not be full-length nucleic acids, since per- formance of the methods of the invention does not rely on the use of full-length nucleic acid sequences. According to the present invention, there is provided a method for enhancing one or more yield-related traits in plants, comprising introducing, preferably by recombinant methods, and expressing in a plant a portion of any one of the nucleic acid sequences given in Table A of the Examples section, or a portion of a nucleic acid encoding an

orthologue, paralogue or homologue of any of the amino acid sequences given in Table A of the Examples section.

A portion of a nucleic acid may be prepared, for example, by making one or more deletions to the nucleic acid. The portions may be used in isolated form or they may be fused to other coding (or non-coding) sequences in order to, for example, produce a protein that combines several activities. When fused to other coding sequences, the resultant polypeptide pro- duced upon translation may be bigger than that predicted for the protein portion.

Portions useful in the methods, constructs, plants, harvestable parts and products of the invention, encode a PMP polypeptide as defined herein or at least part thereof, and have substantially the same biological activity as the amino acid sequences given in Table A of the Examples section. Preferably, the portion is a portion of any one of the nucleic acids given in Table A of the Examples section, or is a portion of a nucleic acid encoding an orthologue or paralogue of any one of the amino acid sequences given in Table A of the Examples section. Preferably the portion is at least 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000, 1 100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600 or 26049onsecutive nucleotides in length, the consecutive nucleotides being of any one of the nucleic acid sequences given in Table A of the Examples section, or of a nucleic acid encoding an orthologue or paralogue of any one of the amino acid sequences given in Table A of the Examples section. Most preferably the portion is a portion of the nucleic acid of SEQ ID NO: 1. Preferably, the portion encodes a fragment of an amino acid sequence which fragment comprises a PFAM domain PF10358 and/or motifsl a, 2, 3b, 4a, 5, A and/or Ba, more preferably motifs 1 ^*, 2^*, 3^*, 4^*, 5^*, A^* and/or B^*, and/or has biological activity as a protein involved in plastid movement protein, and/or has at least 25%, 30%, 35%, 40%, 45%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% % sequence identity to SEQ ID NO: 2.

Another nucleic acid variant useful in the methods, constructs, plants, harvestable parts and products of the invention is a nucleic acid capable of hybridising, under reduced stringency conditions, preferably under stringent conditions, with a nucleic acid encoding a PMP polypeptide as defined herein, or with a portion as defined herein. According to the present invention, there is provided a method for enhancing one or more yield-related traits in plants, comprising introducing, preferably by recombinant methods, and expressing in a plant a nucleic acid capable of hybridizing to the complement of a nucleic acid encoding any one of the proteins given in Table A of the Examples section, or to the complement of a nucleic acid encoding an orthologue, paralogue or homologue of any one of the proteins given in Table A. Hybridising sequences useful in the methods, constructs, plants, harvestable parts and products of the invention encode a PMP polypeptide as defined herein, having substantially the same biological activity as the amino acid sequences given in Table A of the Examples section. Preferably, the hybridising sequence is capable of hybridising to the complement of a nucleic acid encoding any one of the proteins given in Table A of the Examples section, or to a portion of any of these sequences, a portion being as defined herein, or the hybridising sequence is capable of hybridising to the complement of a nucleic acid encoding an orthologue or paralogue of any one of the amino acid sequences given in Table A of the Examples section. Most preferably, the hybridising sequence is capable of hybridising to the complement of a nucleic acid encoding the polypeptide as represented by SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 OR 72, preferably SEQ ID NO: 2 or to a portion thereof. In one embodiment, the hybridization conditions are of medium stringency, preferably of high stringency, as defined herein.

Preferably, the hybridising sequence encodes a polypeptide with an amino acid sequence which comprises a PFAM domain PF10358 and/or motifsi a, 2, 3b, 4a, 5, A and/or Ba, more preferably motifs 1^*, 2^*, 3^*, 4^*, 5^*, A^* and/or B^*, and/or has biological activity as a protein involved in plastid movement protein, and/or has at least 25%, 30%, 35%, 40%, 45%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% % sequence identity to SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 OR 72, preferably SEQ ID NO: 2.

In another embodiment, there is provided a method for enhancing one or more yield-related traits in plants, comprising introducing, preferably by recombinant methods, and expressing in a plant a splice variant of a nucleic acid encoding any one of the proteins given in Table A of the Examples section, or a splice variant of a nucleic acid encoding an orthologue, pa- ralogue or homologue of any of the amino acid sequences given in Table A of the Examples section.

Preferred splice variants are splice variants of a nucleic acid represented by SEQ ID NO: 1 , 53, 55, 57, 59, 61 , 63, 65, 67, 69 OR 71 , preferably SEQ ID NO: 1 , or a splice variant of a nucleic acid encoding an orthologue or paralogue of SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 OR 72, preferably SEQ ID NO: 2. Preferably, the amino acid sequence encoded by the splice variant comprises a PFAM domain PF10358 and/or motifsi a, 2, 3b, 4a, 5, A and/or Ba, more preferably motifs 1 ^*, 2^*, 3^*, 4^*, 5^*, A^* and/or B^*, and/or has biological activity as a protein involved in plastid movement protein, and/or has at least 25%, 30%, 35%, 40%, 45%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% % sequence identity to SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 OR 72, preferably SEQ ID NO: 2.

In yet another embodiment, there is provided a method for enhancing one or more yield- related traits in plants, comprising introducing, preferably by recombinant methods, and expressing in a plant an allelic variant of a nucleic acid encoding any one of the proteins given in Table A of the Examples section, or comprising introducing, preferably by recombinant methods, and expressing in a plant an allelic variant of a nucleic acid encoding an orthologue, paralogue or homologue of any of the amino acid sequences given in Table A of the Examples section.

The polypeptides encoded by allelic variants useful in the methods of the present invention have substantially the same biological activity as the PMP polypeptide of SEQ ID NO: 2 and any of the amino acid sequences depicted in Table A of the Examples section. Allelic vari- ants exist in nature, and encompassed within the methods of the present invention is the use of these natural alleles. Preferably, the allelic variant is an allelic variant of SEQ ID NO: 1 or an allelic variant of a nucleic acid encoding an orthologue or paralogue of SEQ ID NO: 2. Preferably, the amino acid sequence encoded by the allelic variant comprises a PFAM domain PF10358 and/or motifsla, 2, 3b, 4a, 5, A and/or Ba, more preferably motifs 1^*, 2^*, 3^*, 4^*, 5^*, A^* and/or B^*, and/or has biological activity as a protein involved in plastid movement protein, and/or has at least 25%, 30%, 35%, 40%, 45%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% % sequence identity to SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2. In another embodiment the polypeptide sequences useful in the methods, constructs, plants, harvestable parts and products of the invention have substitutions, deletions and/or insertions compared to the sequence of SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, wherein the amino acid substitutions, insertions and/or dele- tions may range from 1 to 10 amino acids each.

In yet another embodiment, there is provided a method for enhancing one or more yield- related traits in plants, comprising introducing, preferably by recombinant methods, and expressing in a plant a variant of a nucleic acid encoding any one of the proteins given in Ta- ble A of the Examples section, or comprising introducing, preferably by recombinant methods, and expressing in a plant a variant of a nucleic acid encoding an orthologue, paralogue or homologue of any of the amino acid sequences given in Table A of the Examples section, which variant nucleic acid is obtained by gene shuffling. Preferably, the amino acid sequence encoded by the variant nucleic acid obtained by gene shuffling comprises a PFAM domain PF10358 and/or motifsla, 2, 3b, 4a, 5, A and/or Ba, more preferably motifs 1 ^*, 2^*, 3^*, 4^*, 5^*, A^* and/or B^*, and/or has biological activity as a pro- tein involved in plastid movement protein, and/or has at least 25%, 30%, 35%, 40%, 45%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% % sequence identity to SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2.

Furthermore, nucleic acid variants may also be obtained by site-directed mutagenesis. Several methods are available to achieve site-directed mutagenesis, the most common be- ing PCR based methods (Current Protocols in Molecular Biology. Wiley Eds.). PMP polypeptides differing from the sequence of SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2by one or several amino acids (substitution(s), insertion(s) and/or deletion(s) as defined herein) may equally be useful to increase the yield of plants in the methods and constructs and plants of the invention.

Nucleic acids encoding PMP polypeptides may be derived from any natural or artificial source. The nucleic acid may be modified from its native form in composition and/or genomic environment through deliberate human manipulation. Preferably the PMP polypep- tide-encoding nucleic acid is from a plant, further preferably from a dicotyledonous plant, more preferably from a tree, most preferably the nucleic acid is from Populus trichocarpa.

The inventive methods for enhancing one or more yield-related traits in plants as described herein comprising introducing, preferably by recombinant methods, and expressing in a plant the nucleic acid(s) as defined herein, and preferably the further step of growing the plants and optionally the step of harvesting the plants or part(s) thereof.

In another embodiment the present invention extends to recombinant chromosomal DNA comprising a nucleic acid sequence useful in the methods of the invention, wherein said nucleic acid is present in the chromosomal DNA as a result of recombinant methods, but is not in its natural genetic environment. In a further embodiment the recombinant chromoso- mal DNA of the invention is comprised in a plant cell. DNA comprised within a cell, particularly a cell with cell walls like a plant cell, is better protected from degradation, damage and / or breakdown than a bare nucleic acid sequence. The same holds true for a DNA construct comprised in a host cell, for example a plant cell.

In a preferred embodiment the invention relates to compositions comprising the recombi- nant chromosomal DNA of the invention and/or the construct of the invention, and a host cell, preferably a plant cell, wherein the recombinant chromosomal DNA and/or the construct are comprised within the host cell, preferably within a plant cell or a host cell with a cell wall. In a further embodiment said composition comprises dead host cells, living host cells or a mixture of dead and living host cells, wherein the recombinant chromosomal DNA and/or the construct of the invention may be located in dead host cells and/or living host cell. Optionally the composition may comprise further host cells that do not comprise the recombinant chromosomal DNA of the invention or the construct of the invention. The com- positions of the invention may be used in processes of multiplying or distributing the recombinant chromosomal DNA and/or the construct of the invention, and or alternatively to protect the recombinant chromosomal DNA and/or the construct of the invention from breakdown and/or degradation as explained herein above. The recombinant chromosomal DNA of the invention and/or the construct of the invention can be used as a quality marker of the compositions of the invention, as an indicator of origin and/or as an indication of producer.

In particular, the methods of the present invention may be performed under non-stress conditions. In an example, the methods of the present invention may be performed under non- stress conditions such as mild drought to give plants having increased yield relative to control plants.

In another embodiment, the methods of the present invention may be performed under stress conditions, preferably under abiotic stress conditions.

In an example, the methods of the present invention may be performed under stress conditions such as drought to give plants having increased yield relative to control plants.

In another example, the methods of the present invention may be performed under stress conditions such as nutrient deficiency to give plants having increased yield relative to control plants.

Nutrient deficiency may result from a lack of nutrients such as nitrogen, phosphates and other phosphorous-containing compounds, potassium, calcium, magnesium, manganese, iron and boron, amongst others.

In yet another example, the methods of the present invention may be performed under stress conditions such as salt stress to give plants having increased yield relative to control plants. The term salt stress is not restricted to common salt (NaCI), but may be any one or more of: NaCI, KCI, LiCI, MgCI2, CaCI2, amongst others.

In yet another example, the methods of the present invention may be performed under stress conditions such as cold stress or freezing stress to give plants having increased yield relative to control plants.

In a preferred embodiment the methods of the invention are performed using plants in need of increased abiotic stress-tolerance for example tolerance to drought, salinity and/or cold or hot temperatures and/or nutrient use due to one or more nutrient deficiency such as nitrogen deficiency. Performance of the methods of the invention gives plants having one or more enhanced yield-related traits. In particular performance of the methods of the invention gives plants having increased yield, especially increased biomass and/or increased seed yield relative to control plants and preferably increased yield comprises or consists of increased above- ground biomass, increased below-ground biomass, increased seed yield and/or increased sugar yield relative to control plants. The terms "yield", biomass and "seed yield" are described in more detail in the "definitions" section herein. The present invention thus provides a method for increasing yield-related traits, especially biomass and seed yield of plants, relative to control plants, which method comprises increasing expression in a plant of a nucleic acid encoding a PMP polypeptide as defined herein.

According to a preferred feature of the present invention, performance of the methods of the invention gives plants having an increased growth rate relative to control plants. Therefore, according to the present invention, there is provided a method for increasing the growth rate of plants, which method comprises increasing expression in a plant of a nucleic acid encod- ing a PMP polypeptide as defined herein.

Performance of the methods of the invention results in plants having

• increased seed yield relative to the seed yield of control plants, and/or

• increased aboveground biomass, in particular stem biomass relative to the above- ground biomass, and in particular stem biomass of control plants, and/or

· increased root biomass relative to the root biomass of control plants and/or increased beet biomass relative to the beet biomass of control plants.

Moreover, it is particularly contemplated that the sugar content (in particular the sucrose content) in the above ground parts, particularly stem (in particular of sugar cane plants) and/or in the belowground parts, in particular in roots including taproots and tubers, and/or in beets (in particular in sugar beets) is increased relative to the sugar content (in particular the sucrose content) in corresponding part(s) of the control plant.

Performance of the methods of the invention gives plants grown under non-stress conditions or under mild drought conditions increased yield-related traits relative to control plants grown under comparable conditions. Therefore, according to the present invention, there is provided a method for increasing yield-related traits in plants grown under non-stress conditions or under mild drought conditions, which method comprises increasing expression in a plant of a nucleic acid encoding a PMP polypeptide. Performance of the methods of the invention gives plants grown under conditions of drought, increased yield-related traits relative to control plants grown under comparable conditions. Therefore, according to the present invention, there is provided a method for increasing yield-related traits in plants grown under conditions of drought which method comprises increasing expression in a plant of a nucleic acid encoding a PMP polypeptide.

Performance of the methods of the invention gives plants grown under conditions of nutrient deficiency, particularly under conditions of nitrogen deficiency, increased yield-related traits relative to control plants grown under comparable conditions. Therefore, according to the present invention, there is provided a method for increasing yield-related traits in plants grown under conditions of nutrient deficiency, which method comprises increasing expression in a plant of a nucleic acid encoding a PMP polypeptide. Performance of the methods of the invention gives plants grown under conditions of salt stress, increased yield-related traits relative to control plants grown under comparable conditions. Therefore, according to the present invention, there is provided a method for increasing yield-related traits in plants grown under conditions of salt stress, which method comprises increasing expression in a plant of a nucleic acid encoding a PMP polypeptide.

In one embodiment of the invention, root biomass is increased, preferably beet and/or taproot biomass, more preferably in sugar beet plants, and optionally seed yield and/or above ground biomass are not increased.

In another embodiment of the invention, above ground biomass is increased, preferably stem, stalk and/or sett biomass, more preferably in Poaceae, even more preferably in a Saccharum species, most preferably in sugarcane, and optionally seed yield, below-ground biomass and/or root growth is not increased.

In a further embodiment the total harvestable sugar, preferably glucose, fructose and/or sucrose, is increased, preferably in addition to increased other yield-related traits as defined herein, for example biomass, and more preferably also in addition to an increase in sugar content, preferably glucose, fructose and/or sucrose content.

The invention also provides genetic constructs and vectors to facilitate introduction and/or expression in plants of nucleic acids encoding PMP polypeptides. The gene constructs may be inserted into vectors, which may be commercially available, suitable for transforming into plants or host cells and suitable for expression of the gene of interest in the transformed cells. The invention also provides use of a gene construct as defined herein in the methods of the invention.

More specifically, the present invention provides a construct comprising:

(a) a nucleic acid encoding a PMP polypeptide as defined above;

(b) one or more control sequences capable of driving expression of the nucleic acid sequence of (a); and optionally

(c) a transcription termination sequence.

Preferably, the nucleic acid encoding a PMP polypeptide is as defined above. The term "control sequence" and "termination sequence" are as defined herein. In particular the genetic construct of the invention is a plant expression construct, i.e. a genetic construct that allows for the expression of the nucleic acid encoding a PMP in a plant, plant cell or plant tissue after the construct has been introduced into this plant, plant cell or plant tissue, preferably by recombinant means. The plant expression construct may for example comprise said nucleic acid encoding a PtMYB12L in functional linkage to a promoter and optionally other control sequences controlling the expression of said nucleic acid in one or more plant cells, wherein the promoter and optional the other control sequences are not natively found in functional linkage to said nucleic acid. In a preferred embodiment the con- trol sequence(s) including the promoter result in overexpression of said nucleic acid when the construct of the invention has been introduced into a plant, plant cell or plant tissue.

The genetic construct of the invention may be comprised in a host cell - for example a plant cell - seed, agricultural product or plant. Plants or host cells are transformed with a genetic construct such as a vector or an expression cassette comprising any of the nucleic acids described above. Thus the invention furthermore provides plants or host cells transformed with a construct as described above. In particular, the invention provides plants transformed with a construct as described above, which plants have increased yield-related traits as de- scribed herein.

In one embodiment the genetic construct of the invention confers increased yield or yield related traits(s) to a plant when it has been introduced into said plant, which plant expresses the nucleic acid encoding the PMPPMP polypeptide comprised in the genetic construct and preferably resulting in increased abundance of the PMP polypeptide. In another embodiment the genetic construct of the invention confers increased yield or yield related traits(s) to a plant comprising plant cells in which the construct has been introduced, which plant cells express the nucleic acid encoding the PMP comprised in the genetic construct. The promoter in such a genetic construct may be a non-native promoter to the nucleic acid described above, i.e. a promoter different from the promoter regulating the expression of said nucleic acid in its native surrounding.

In a preferred embodiment the nucleic acid encoding the PMP polypeptide useful in the methods, constructs, plants, harvestable parts and products of the invention is in functional linkage to a promoter resulting in the expression of said nucleic acid encoding a PMP poly- peptide in

aboveground biomass preferably the leaves and shoot, more preferably the stem, of monocot plants, preferably Poaceae plants, more preferably Saccharum species plants, and/or

leaves, belowground biomass and/or root biomass, preferably tubers, taproots and/or beet organs, more preferably taproot and beet organs of dicot plants, more preferably

Solanaceae and/or Beta species plants.

The expression cassettes or the genetic construct of the invention may be comprised in a host cell, plant cell, seed, agricultural product or plant.

The skilled artisan is well aware of the genetic elements that must be present on the genetic construct in order to successfully transform, select and propagate host cells containing the sequence of interest. The sequence of interest is operably linked to one or more control sequences (at least to a promoter).

Advantageously, any type of promoter, whether natural or synthetic, may be used to drive expression of the nucleic acid sequence, but preferably the promoter is of plant origin. A constitutive promoter is particularly useful in the methods. See the "Definitions" section herein for definitions of the various promoter types.

The constitutive promoter is preferably a ubiquitous constitutive promoter of medium strength. More preferably it is a plant derived promoter, e.g. a promoter of plant chromoso- mal origin, such as a GOS2 promoter or a promoter of substantially the same strength and having substantially the same expression pattern (a functionally equivalent promoter), more preferably the promoter is the promoter GOS2 promoter from rice. Further preferably the constitutive promoter is represented by a nucleic acid sequence substantially similar to SEQ ID NO: 31 , most preferably the constitutive promoter is as represented by SEQ ID NO: 31. See the "Definitions" section herein for further examples of constitutive promoters.

It should be clear that the applicability of the present invention is not restricted to the PMP polypeptide-encoding nucleic acid represented by SEQ ID NO: 1 , nor is the applicability of the invention restricted to the rice GOS2 promoter when expression of a PMP polypeptide- encoding nucleic acid is driven by a constitutive promoter.

Yet another embodiment relates to genetic constructs useful in the methods, vector constructs, plants, harvestable parts and products of the invention wherein the genetic construct comprises the PMP nucleic acid of the invention functionally linked to a promoter as disclosed herein above and further functionally linked to one or more

1 ) nucleic acid expression enhancing nucleic acids (NEENAs):

a) as disclosed in the international patent application published as

WO2011/023537 in table 1 on page 27 to page 28 and/or SEQ ID NO: 1 to 19 and/or as defined in items i) to vi) of claim 1 of said international application which NEENAs are herewith incorporated by reference; and/or

b) as disclosed in the international patent application published as

WO2011/023539 in table 1 on page 27 and/or SEQ ID NO: 1 to 19 and/or as defined in items i) to vi) of claim 1 of said international application which NEENAs are herewith incorporated by reference; and/or

c) and/or as contained in or disclosed in:

i) the European priority application filed on 05 July 201 1 as EP 11 172672.5 in table 1 on page 27 and/or SEQ ID NO: 1 to 14937, preferably SEQ ID NO: 1 to 5, 14936 or 14937, and/or as defined in items i) to v) of claim 1 of said European priority application which NEENAs are herewith incorpo- rated by reference; and/or

ii) the European priority application filed on 06 July 201 1 as EP 1 1172825.9 in table 1 on page 27 and/or SEQ ID NO: 1 to 65560, preferably SEQ ID NO: 1 to 3, and/or as defined in items i) to v) of claim 1 of said European priority application which NEENAs are herewith incorporated by reference; and/or

d) equivalents having substantially the same enhancing effect;

and/or 2) functionally linked to one or more Reliability Enhancing Nucleic Acid (RENA) molecule a) as contained in or disclosed in the European priority application filed on 15 September 201 1 as EP 11 181420.8 in table 1 on page 26 and/or SEQ ID NO: 1 to 16 or 94 to 1 16666, preferably SEQ ID NO: 1 to 16, and/or as defined in point i) to v) of item a) of claim 1 of said European priority application which RENA molecule^) are herewith incorporated by reference; or

b) equivalents having substantially the same enhancing effect.

A preferred embodiment of the invention relates to a nucleic acid molecule useful in the methods, constructs, plants, harvestable parts and products of the invention and encoding a PMP polypeptide of the invention under the control of a promoter as described herein above, wherein the NEENA, RENA and/or the promoter is heterologous to said nucleic acid molecule encoding a PMP polypeptide of the invention. With respect to the sequences of the invention or useful in the methods, constructs, plants, harvestable parts and products of the invention, in one embodiment a nucleic acid or a polypeptide sequence originating not from higher plants is used in the methods of the invention or the expression construct useful in the methods of the invention. In another embodiment a nucleic acid or a polypeptide sequence of plant origin is used in the methods, constructs, plants, harvestable parts and products of the invention because said nucleic acid and polypeptides has the characteristic of a codon usage optimised for expression in plants, and of the use of amino acids and regulatory sites common in plants, respectively. The plant of origin may be any plant, but preferably those plants as described herein. In yet another embodiment a nucleic acid sequence originating not from higher plants but artificially altered to have the codon usage of higher plants is used in the expression construct useful in the methods of the invention.

Optionally, one or more terminator sequences may be used in the construct introduced into a plant. Those skilled in the art will be aware of terminator sequences that may be suitable for use in performing the invention. Preferably, the construct comprises an expression cassette comprising a GOS2 promoter, substantially similar to SEQ ID NO: 31 , operably linked to the nucleic acid encoding the PMP polypeptide. Furthermore, one or more sequences encoding selectable markers may be present on the construct introduced into a plant. According to a preferred feature of the invention, the modulated expression is increased expression. Methods for increasing expression of nucleic acids or genes, or gene products, are well documented in the art and examples are provided in the definitions section.

As mentioned above, a preferred method for increasing expression of a nucleic acid encod- ing a PMP polypeptide is by introducing, preferably by recombinant methods, and expressing in a plant a nucleic acid encoding a PMP polypeptide; however the effects of performing the method, i.e. enhancing one or more yield-related traits may also be achieved using oth- er well-known techniques, including but not limited to T-DNA activation tagging, TILLING, homologous recombination. A description of these techniques is provided in the definitions section. The invention also provides a method for the production of transgenic plants having one or more enhanced yield-related traits relative to control plants, comprising introduction and expression in a plant of any nucleic acid encoding a PMP polypeptide as defined herein.

More specifically, the present invention provides a method for the production of transgenic plants having one or more enhanced yield-related traits, particularly increased seed yield and/or biomass, which method comprises:

(i) introducing, preferably by recombinant methods, and expressing in a plant or plant cell a PMP polypeptide-encoding nucleic acid or a genetic construct comprising a PMP polypeptide-encoding nucleic acid; and

(ii) cultivating the plant cell under conditions promoting plant growth and development, preferably promoting plant growth and development of plants having one or more enhanced yield-related traits relative to control plants.

The nucleic acid of (i) may be any of the nucleic acids capable of encoding a PMP polypep- tide as defined herein.

Cultivating the plant cell under conditions promoting plant growth and development, may or may not include regeneration and/or growth to maturity. Accordingly, in a particular embodiment of the invention, the plant cell transformed by the method according to the invention is regenerable into a transformed plant. In another particular embodiment, the plant cell transformed by the method according to the invention is not regenerable into a transformed plant, i.e. cells that are not capable to regenerate into a plant using cell culture techniques known in the art. While plants cells generally have the characteristic of totipotency, some plant cells can not be used to regenerate or propagate intact plants from said cells. In one embodiment of the invention the plant cells of the invention are such cells. In another embodiment the plant cells of the invention are plant cells that do not sustain themselves in an autotrophic way. One example are plant cells that do not sustain themselves through photosynthesis by synthesizing carbohydrate and protein from such inorganic substances as water, carbon dioxide and mineral salt.

The nucleic acid may be introduced directly into a plant cell or into the plant itself (including introduction into a tissue, organ or any other part of a plant). According to a preferred feature of the present invention, the nucleic acid is preferably introduced into a plant or plant cell by transformation. The term "transformation" is described in more detail in the "defini- tions" section herein. In one embodiment the methods of the invention are methods for the production of a transgenic Poaceae plant, preferably a Saccharum species plant, a transgenic plant part, or transgenic plant cell having one or more enhanced yield-related traits relative to control plants, comprises the step of harvesting setts from the transgenic plant and planting the setts and growing the setts to plants, wherein the setts comprises the exogenous nucleic acid encoding the PMP polypeptide and the promoter sequence operably linked thereto.

In one embodiment the present invention extends to any plant cell or plant produced by any of the methods described herein, and to all plant parts and propagules thereof.

The present invention encompasses plants or parts thereof (including seeds) obtainable by the methods according to the present invention. The plants or plant parts or plant cells comprise a nucleic acid transgene encoding a PMP polypeptide as defined above, preferably in a genetic construct such as an expression cassette. The present invention extends further to encompass the progeny of a primary transformed or transfected cell, tissue, organ or whole plant that has been produced by any of the aforementioned methods, the only requirement being that progeny exhibit the same genotypic and/or phenotypic characteristics) as those produced by the parent in the methods according to the invention. In a further embodiment the invention extends to seeds recombinantly comprising the expression cassettes of the invention, the genetic constructs of the invention, or the nucleic acids encoding the PMP and/or the PMP polypeptides as described above. Typically a plant grown from the seed of the invention will also show enhanced yield-related traits. The invention also includes host cells containing an isolated nucleic acid encoding a PMP polypeptide as defined above. In one embodiment host cells according to the invention are plant cells, yeasts, bacteria or fungi. Host plants for the nucleic acids, construct, expression cassette or the vector used in the method according to the invention are, in principle, advantageously all plants which are capable of synthesizing the polypeptides used in the in- ventive method. In a particular embodiment the plant cells of the invention overexpress the nucleic acid molecule of the invention.

In a further embodiment the invention relates to a transgenic pollen grain comprising the construct of the invention and/or a haploid derivate of the plant cell of the invention. Alt- hough in one particular embodiment the pollen grain of the invention can not be used to regenerate an intact plant without adding further genetic material and/or is not capable of photosynthesis, said pollen grain of the invention may have uses in introducing the enhanced yield related trait into another plant by fertilizing an egg cell of the other plant using a live pollen grain of the invention, producing a seed from the fertilized egg cell and growing a plant from the resulting seed. Further pollen grains find use as marker of geographical and/or temporal origin. The methods of the invention are advantageously applicable to any plant, in particular to any plant as defined herein. Plants that are particularly useful in the methods of the invention include all plants which belong to the superfamily Viridiplantae, in particular monocotyledonous and dicotyledonous plants including fodder or forage legumes, ornamental plants, food crops, trees or shrubs. According to an embodiment of the present invention, the plant is a crop plant. Examples of crop plants include but are not limited to chicory, carrot, cassava, trefoil, soybean, beet, sugar beet, sunflower, canola, alfalfa, rapeseed, linseed, cotton, tomato, potato Stevia species such as but not limited to Stevia rebaudiana and tobacco. According to another embodiment of the present invention, the plant is a monocotyledonous plant. Examples of monocotyledonous plants include sugarcane. According to another embodiment of the present invention, the plant is a cereal. Examples of cereals include rice, maize, wheat, barley, millet, rye, triticale, sorghum, emmer, spelt, einkorn, teff, milo and oats. In a particular embodiment the plants of the invention or used in the methods of the invention are selected from the group consisting of maize, wheat, rice, soybean, cotton, oilseed rape including canola, sugarcane, sugar beet and alfalfa. Advantageously the methods of the invention are more efficient than the known methods, because the plants of the invention have increased yield and/or tolerance to an environmental stress compared to control plants used in comparable methods. The invention also extends to harvestable parts of a plant such as, but not limited to seeds, leaves, fruits, flowers, setts, stems, roots, rhizomes, tubers and bulbs, which harvestable parts comprise a recombinant nucleic acid encoding a PMP polypeptide as defined herein. . In particular, such harvestable parts are roots such as taproots, rhizomes, fruits, stems, beets, tubers, bulbs, leaves, flowers and / or seeds. In one embodiment harvestable parts are stem cuttings (like setts of sugar cane) or beets of sugar beet.

The invention furthermore relates to products derived or produced, preferably directly derived or directly produced, from one or more harvestable part(s) of such a plant, such as dry pellets, pressed stems, setts, meal or powders, fibres, cloth, paper or cardboard containing fibres produced by the plants of the invention, oil, fat and fatty acids, starch, - including starches, paper or cardboard containing carbohydrates produced by the plants of the invention -, sap, juice, chaff or proteins. Preferred carbohydrates are starches , cellulose and / or sugars, preferably sucrose. Also preferred products are residual dry fibers, e.g., of the stem (like bagasse from sugar cane after cane juice removal), molasse, or filtercake, preferably from sugar cane. Said products can be agricultural products.

In one embodiment the product comprises a recombinant nucleic acid encoding a PMP polypeptide and/or a recombinant PMP polypeptide for example as an indicator of the particular quality of the product. In another embodiment the invention relates to anti-counterfeit milled seed, milled stem and/or milled root having as an indication of origin and/or as an indication of producer a plant cell of the invention and/or the construct of the invention, wherein milled root preferably is milled beet, more preferably milled sugar beet.

The invention also includes methods for manufacturing a product comprising a) growing the plants of the invention and b) producing said product from or by the plants of the invention or parts thereof, including stem, sett, root, beet and/or seeds. In a further embodiment the methods comprise the steps of a) growing the plants of the invention, b) removing the harvestable parts as described herein from the plants and c) producing said product from, or with the harvestable parts of plants according to the invention. In one embodiment the method of the invention is a method for manufacturing cloth by a) growing the plants of the invention that are capable of producing fibres usable in cloth making, e.g. cotton, b) removing the harvestable parts as described herein from the plants, and c) producing fibres from said harvestable part and d) producing cloth from the fibres of c). Another embodiment of the invention relates to a method for producing feedstuff for bioreactors, fermentation processes or biogas plants, comprising a) growing the plants of the invention, b) removing the harvestable parts as described herein from the plants and c) producing feedstuff for bioreactors, fermentation processes or biogas plants. In a preferred embodiment the method of the invention is a method for producing alcohol(s) from plant material comprising a) growing the plants of the invention, b) removing the harvestable parts as described herein from the plants and c) optionally producing feedstuff for fermentation process, and d) - following step b) or c) - producing one or more alcohol(s) from said feedstuff or harvestable parts, preferably by using microorganisms such as fungi, algae, bacteria or yeasts, or cell cultures. A typical example would be the production of ethanol using carbohydrate containing harvest- able parts, for example corn seed, sugarcane stem parts or beet parts of sugar beet. In one embodiment, the product is produced from the stem of the transgenic plant. . In another embodiment the product is produced from the root, preferable taproot and/or beet of the plant.

In another embodiment the method of the invention is a method for the production of one or more polymers comprising a) growing the plants of the invention, b) removing the harvestable parts as described herein from the plants and c) producing one or more monomers from the harvestable parts, optionally involving intermediate products, d) producing one or more polymer(s) by reacting at least one of said monomers with other monomers or reacting said monomer(s) with each other. In another embodiment the method of the invention is a meth- od for the production of a pharmaceutical compound comprising a) growing the plants of the invention, b) removing the harvestable parts as described herein from the plants and c) producing one or more monomers from the harvestable parts, optionally involving intermediate products, d) producing a pharmaceutical compound from the harvestable parts and/or intermediate products. In another embodiment the method of the invention is a method for the production of one or more chemicals comprising a) growing the plants of the invention, b) removing the harvestable parts as described herein from the plants and c) producing one or more chemical building blocks such as but not limited to Acetate, Pyruvate, lactate, fatty acids, sugars, amino acids, nucleotides, carotenoids, terpenoids or steroids from the harvestable parts, optionally involving intermediate products, d) producing one or more chemi- cal(s) by reacting at least one of said building blocks with other building block or reacting said building block(s) with each other. The present invention is also directed to a product obtained by a method for manufacturing a product, as described herein. In a further embodiment the products produced by the manufacturing methods of the invention are plant products such as, but not limited to, a foodstuff, feedstuff, a food supplement, feed supplement, fibre, cosmetic or pharmaceutical. In another embodiment the methods for production are used to make agricultural products such as, but not limited to, fibres, plant extracts, meal or presscake and other leftover material after one or more extraction processes, flour, proteins, amino acids, carbohydrates, fats, oils, polymers, vitamins, and the like. Preferred carbohydrates are sugars, preferably sucrose. In one embodiment the agricultural product is selected from the group consisting of 1 ) fibres, 2) timber, 3) plant extracts, 4) meal or presscake or other leftover material after one or more extraction processes, 5) flour, 6) proteins, 7) carbohydrates, 8) fats, 9) oils, 10) polymers e.g. cellulose, starch, lignin, lignocellulose, and 11 ) combinations and/or mixtures of any of 1 ) to 10). In a preferable embodiment the product or agricultural product does generally not comprise living plant cells, does comprise the expression cassette, genetic construct, protein and/or polynucleotide as described herein.

In yet another embodiment the polynucleotides or the polypeptides or the constructs of the invention are comprised in an agricultural product. In a particular embodiment the nucleic acid sequences and protein sequences of the invention may be used as product markers, for example where an agricultural product was produced by the methods of the invention. Such a marker can be used to identify a product to have been produced by an advantageous process resulting not only in a greater efficiency of the process but also improved quality of the product due to increased quality of the plant material and harvestable parts used in the process. Such markers can be detected by a variety of methods known in the art, for example but not limited to PCR based methods for nucleic acid detection or antibody based methods for protein detection.

The present invention also encompasses use of nucleic acids encoding PMP polypeptides as described herein and use of these PMP polypeptides in enhancing any of the aforemen- tioned yield-related traits in plants. For example, nucleic acids encoding PMP polypeptide described herein, or the PMP polypeptides themselves, may find use in breeding programmes in which a DNA marker is identified which may be genetically linked to a PMP polypeptide-encoding gene. The nucleic acids/genes, or the PMP polypeptides themselves may be used to define a molecular marker. This DNA or protein marker may then be used in breeding programmes to select plants having one or more enhanced yield-related traits as defined herein in the methods of the invention. Furthermore, allelic variants of a PMP polypeptide-encoding nucleic acid/gene may find use in marker-assisted breeding programmes. Nucleic acids encoding PMP polypeptides may also be used as probes for genetically and physically mapping the genes that they are a part of, and as markers for traits linked to those genes. Such information may be useful in plant breeding in order to develop lines with desired phenotypes. In a preferred embodiment, the POI polypeptide useful in the methods of the invention is not 1. Any of the polypeptides disclosed in the patent application US2007039067, published on 15th February 2007, and more preferably is not the sequences disclosed in said application as SEQ ID NO 19887; and/or

2. Any of the polypeptides disclosed in the patent application US2004031072, published on 12^th February 2004, and more preferably not the sequence disclosed as SEQ ID NO: 281286 of said patent application and/or as AFQ90109 in the Geneseq database (status 19^th September 2012), available from Thomson Reuters, 3 Times Square, New York, NY 10036, USA; and/or

3. Any of the polypeptides disclosed in the patent application US200701 1783, published on 1 1^th January 2007, and more preferably not the sequence disclosed as SEQ ID NO: 52853 of said patent application and/or as ANO16009 in the Geneseq database (status 19^th September 2012), available from Thomson Reuters, 3 Times Square, New York, NY 10036, USA.

In one embodiment, the total storage carbohydrate content of the plants of the invention, or parts thereof and in particular of the harvestable parts of the plant(s) is increased compared to control plant(s) and the corresponding plant parts of the control plants.

Storage carbohydrates are preferably sugars such as but not limited to sucrose, fructose and glucose, and polysaccharides such as but not limited to starches, glucans and fructans. The total storage carbohydrate content and the content of individual groups or species of carbohydrates may be measured in a number of ways known in the art. For example, the international application published as WO2006066969 discloses in paragraphs [79] to [117] a method to determine the total storage carbohydrate content of sugarcane, including fructan con- tent.

Another method for sugarcane is as follows:

The transgenic sugarcane plants are grown for 10 to 15 months, either in the greenhouse or the field. Standard conditions for growth of the plants are used.

Stalks of sugarcane plants which are 10 to 15 months old and have more than 10 inter- nodes are harvested. After all of the leaves have been removed, the internodes of the stalk are numbered from top (= 1) to bottom (for example = 36). A stalk disc approximately 1 -2 g in weight is excised from the middle of each internode. The stalk discs of 3 internodes are then combined to give one sample and frozen in liquid nitrogen.

For the sugar extraction, the stalk discs are first comminuted in a Waring blender (from Waring, New Hartford, Connecticut, USA). The sugars are extracted by shaking for one hour at 95°C in 10 mM sodium phosphate buffer pH 7.0. Thereafter, the solids are removed by filtration through a 30 μιη sieve. The resulting solution is subsequently employed for the sugar determination (see herein below).

The transgenic sugarcane plants are grown for 10 to 15 months. In each case a sugarcane stalk of the transgenic line and a wild-type sugarcane plant is defoliated, the stalk is divided into segments of 3 internodes, and these internode segments are frozen in liquid nitrogen in a sealed 50 ml plastic container. The fresh weight of the samples is determined. The extraction for the purposes of the sugar determination is done as described below.

The glucose, fructose and sucrose contents in the extract obtained in accordance with the sugar extraction method described above is determined photometrically in an enzyme as- say via the conversion of NAD+ (nicotinamide adenine dinucleotide) into NADH (reduced nicotinamide adenine dinucleotide). During the reduction, the aromatic character at the nicotinamide ring is lost, and the absorption spectrum thus changes. This change in the absorption spectrum can be detected photometrically. The glucose and fructose present in the extract is converted into glucose-6-phosphate and fructose-6-phosphate by means of the enzyme hexokinase and adenosin triphosphate (ATP). The glucose- 6-phosphate is subsequently oxidized by the enzyme glucose-6-phosphate dehydrogenase to give 6- phosphogluconate. In this reaction, NAD+ is reduced to give NADH, and the amount of NADH formed is determined photometrically. The ratio between the NADH formed and the glucose present in the extract is 1 :1 , so that the glucose content can be calculated from the NADH content using the molar absorption coefficient of NADH (6.3 1 per mmol and per cm lightpath). Following the complete oxidation of glucose-6-phosphate, fructose-6-phosphate, which has likewise formed in the solution, is converted by the enzyme phosphoglucoiso- merase to give glucose- 6-phosphate which, in turn, is oxidized to give 6- phosphogluconate. Again, the ratio between fructose and the amount of NADH formed is 1 :1. Thereafter, the sucrose present in the extract is cleaved by the enzyme sucrase

(Megazyme) to give glucose and fructose. The glucose and fructose molecules liberated are then converted with the abovementioned enzymes in the NAD+-dependent reaction to give 6- phosphogluconate. The conversion of one sucrose molecule into 6- phosphogluconate results in two NADH molecules. The amount of NADH formed is likewise determined photometrically and used for calculating the sucrose content, using the molar absorption coefficient of NADH.

The sugarcane stalks are divided into segments of in each case three internodes, as specified above. The internodes are numbered from top to bottom (top = internode 1 , bottom = internode 21).

Furthermore transgenic sugarcane plants may be analysed using any method known in the art for example but not limited to:

• The Sampling of Sugar Cane by the Full Width Hatch Sampler; ICUMSA (International Commission for Uniform Methods of Sugar Analysis,

http://www.icumsa.org/index.php?id=4) Method GS 5-5 (1994) available from Verlag

Dr. Albert Bartens KG, Luckhoffstr. 16, 14129 Berlin (http://www.bartens.com/)

• The Sampling of Sugar Cane by the Corer Method; ICUMSA Method GS 5-7 (1994) available from Verlag Dr. Albert Bartens KG, Luckhoffstr. 16, 14129 Berlin

(http://www.bartens.com/)

· The Determination of Sucrose by Gas Chromatography in Molasses and Factory

Products - Official; and Cane Juice; ICUMSA Method GS 4/7/8/5-2 (2002) available from Verlag Dr. Albert Bartens KG, Luckhoffstr. 16, 14129 Berlin

(http://www.bartens.com/)

• The Determination of Sucrose, Glucose and Fructose by HPLC -in Cane Molasses- and Sucrose in Beet Molasses; ICUMSA Method GS 7/4/8-23 (2011 ) available from Verlag Dr. Albert Bartens KG, Luckhoffstr. 16, 14129 Berlin (http://www.bartens.com/)

• The Determination of Glucose, Fructose and Sucrose in Cane Juices , Syrups and Molasses, and of Sucrose in Beet Molasses by High Performance Ion Chromatography; ICUMSA Method GS 7/8/4-24 (201 1 ) available from Verlag Dr. Albert Bartens KG, Luckhoffstr. 16, 14129 Berlin (http://www.bartens.com/).

For crops other than sugarcane, similar methods are known in the art or can easily be adapted from a known method for another crop. For example, the storage carbohydrate content of sugar beet may be determined by any of methods described for sugarcane above with adaptations to sugar beet.

Further transgenic sugar beet plants may be analysed for biomass or their sugar content or other phenotypic parameters using any method known in the art for example but not limited to:

• The Determination of Glucose and Fructose in Beet Juices and Processing Products by an Enzymatic Method - ICUMSA (International Commission for Uniform Methods of Sugar Analysis, http://www.icumsa.org/index.php?id=4) Method GS 8/4/6-4 (2007) available from Verlag Dr. Albert Bartens KG, Luckhoffstr. 16, 14129 Berlin

(http://www.bartens.com/)

• The Determination of Mannitol, Glucose, Fructose, Sucrose and Raffinose in Beet Brei and Beet Juices by HPAEC-PAD; ICUMSA Method GS8-26 (201 1) available from Ver- lag Dr. Albert Bartens KG, Luckhoffstr. 16, 14129 Berlin (http://www.bartens.com/)

• The Determination of Glucose, Fructose and Sucrose in Cane Juices , Syrups and Mo- lasses, and of Sucrose in Beet Molasses by High Performance Ion Chromatography;

ICUMSA Method GS 7/8/4-24 (201 1 ) available from Verlag Dr. Albert Bartens KG, Luckhoffstr. 16, 14129 Berlin (http://www.bartens.com/)

• The Determination of Glucose and Fructose in Beet Juices and Processing Products by an Enzymatic Method; ICUMSA Method GS 8/4/6-4 (2007) available from Verlag Dr. Albert Bartens KG, Luckhoffstr. 16, 14129 Berlin (http://www.bartens.com/)

• The Determination of the Apparent Total Sugar Content of Beet Pulp by the Luff

Schoorl Procedure; ICUMSA Method GS 8-5 (1994) available from Verlag Dr. Albert Bartens KG, Luckhoffstr. 16, 14129 Berlin (http://www.bartens.com/). In the following, the expression "as defined in claim/item X" is meant to direct the artisan to apply the definition as disclosed in item/claim X. For example, "a nucleic acid as defined in item 1" has to be understood so that the definition of the nucleic acid as in item 1 is to be applied to the nucleic acid. In consequence the term " as defined in item" or " as defined in claim" may be replaced with the corresponding definition of that item or claim, respectively.

Further embodiments

The definitions and explanations given herein above apply mutatis mutandis to the following embodiments.

Moreover, the present invention relates to the following specific embodiments:

1. A method for enhancing one or more yield-related traits in plants relative to control plants, comprising increasing expression in a plant of a nucleic acid encoding a PMP polypeptide, wherein said PMP polypeptide comprises PFAM domain PF10358.

Method according to embodiment 1 , wherein said PMP polypeptide is selected from the group consisting of:

(i) an amino acid sequence represented by SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2; and

(ii) an amino acid sequence having, in increasing order of preference, at least 25%, 30%, 35%, 40%, 45%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to the amino acid sequence represented by SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2, over the entire length of the sequences represented by SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2, and further preferably conferring one or more enhanced yield-related traits relative to control plants.

Method according to embodiment 1 or 2, wherein said increased expression is effected by introducing and expressing in a plant said nucleic acid encoding said PMP polypeptide.

Method according to embodiment 1 , 2 or 3, wherein said nucleic acid is selected from the group consisting of:

(ii) the complement of a nucleic acid represented by SEQ ID NO: 1 , 3, 5, 7, 9, 11 , 13, 15, 17, 19, 21 , 23, 25, 27, 29, 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 ; pref- erably SEQ ID NO: 1 , 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 , more preferably SEQ ID NO: 1 ;

(iii) a nucleic acid encoding a PMP polypeptide having in increasing order of preference at least 25%, 30%, 35%, 40%, 45%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to the entire amino acid sequence represented by SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2, and further preferably conferring one or more enhanced yield-related traits relative to control plants; and

(iv) a nucleic acid molecule which hybridizes with a nucleic acid molecule of (i) to (iii) under high stringency hybridization conditions and preferably confers one or more enhanced yield-related traits relative to control plants.

Method according to any of embodiments 1 to 4, wherein said one or more enhanced yield-related traits comprise increased yield relative to control plants, and preferably comprise increased biomass and/or increased seed yield relative to control plants, and preferably comprise or consist of increased aboveground biomass, increased below-ground biomass, increased seed yield and/or increased sugar yield relative to control plants.

Method according to any one of embodiments 1 to 5, wherein said one or more enhanced yield-related traits are obtained under non-stress conditions.

Method according to any of embodiments 1 to 6, wherein said PMP polypeptide comprises

(i) all of the following motifs: Motif 1a (SEQ ID NO 35):

[M/V/I][P/A/G/S][L/I/M/T][D/E][E/D][L/M/V][L/I/V/M]GKT[A/G]E[Q/H][I/V]AFEG[I/M

][A/V][S/T/N]A[I/V]I[Q/S/L][G/A]R[N/S][K/A][E/D/A][G/R/V/L][G/V]A[S/T/N][S/T][S/

T] AA[R/Q/E] [T/l/S/A] [l/V] [A/S/T]

or alternatively Motif 1 (SEQ ID NO: 34):

[M/V/I][P/A/G/S][L/I/M/T][D/E][E/D][L/M/V][L/I/V/M]GKT[A/G]E[Q/H][I/V]AFEG[I/M ][A/V][S/T/N]A[I/V]I[Q/S/L][G/A]R[N/S][K/A][E/D/A][G/R/V/L][G/V]A[S/T/N][S/T][S/ T]AA[R/Q/E][T/I/S/A][I/V][AST]; and

Motif 2 (SEQ ID NO: 36): [V/N/I/C][Y/F][L/I/V][S/P][E/D]LGKG[L/I][G/S][C/P][V/L/I][V/I][Q/R]T[R/K][D/N]GG[ Y/F]L[A/V/T][A/S][T/M/L]NP[L/F][D/N][T/I/V/N][I/A/V/L/P][V/M][S/A/T/M/G/E][R/K][ K/N][D/E][T/A/L]PKL[A/V]MQ[L/I/M]S[K/R][P/A/Q][L/F/Y/I/M/V][V/I/L][L/V/F]; and

Motif 3b (SEQ ID NO: 39):

[S/K/E/L/V][K/E/S/A][G/D/E/S][K/Q/P/E/H/N][D/E][L/V/M/I/F/Q]LWS[I/L/M]SSR[I/V

][M/V]ADMWL[K/R][P/T/S/H][M/I/L]RNPD[V/I][K/N/I]

or alternatively Motif 3 (SEQ ID NO: 37):

[S/K/E/L/V][K/E/S/A][G/D/E/S]QQ[K/Q/P/E/H/N][D/E][L/V/M/I/F/Q]LWS[I/L/M]SS

R[I/V][M/V]ADMWL[K/R][P/T/S/H][M/I/L]RNPD[V/I][K/N/I]

or alternatively Motif 3a (SEQ ID NO 38):

[S/K/E/L/V][K/E/S/A][G/D/E/S][Q/NONE][K/Q/P/E/H/N][D/E][L/V/M/l/F/Q]LWS[l/L/ M]SSR[I/V][M/V]ADMWL[K/R][P/T/S/H][M/I/L]RNPD[V/I][K/N/I]; and

Motif 4a (SEQ ID NO: 41):

M[A/G/S][T/N/S/V][A/I/G][M/T/L/I][S/N/T][T/S/D/Y][G/S]R[K/Q/N][E/D]RI[S/T/A/M/

D][T/S]G[I/L]WN[V/M/I/A][N/D/E/S/H/Q][E/D][N/T/E/D/S]P[L/V/F]T[A/V/G/S][E/D][

E/K/N][V/I/L]L[A/S][F/V/C/I][S/T/A][L/M/T]QK[I/V/L/M]E[V/A/S/F/T]M[A/V/T][I/V][E/

K][A/G]LK[I/V]Q[A/V][E/D/G][I/M/V][A/V/S/T][E/D/K][E/D]

or alternatively Motif 4(SEQ ID NO: 40):

M[A/G/S][T/N/S/V][A/I/G][M/T/L/I][S/N/T][T/S/D/Y][G/S]R[K/Q/N][E/D]RI[S/T/A/M/ D][T/S]G[I/L]WN[V/M/I/A][N/D/E/S/H/Q][E/D][N/T/E/D/S]P[L/V/F]TS[A/V/G/S][E/D ][E/K/N][V/I/L]L[A/S][F/V/C/I][S/T/A][L/M/T]QK[I/V/L/M]E[V/A/S/F/T]M[A/V/T][I/V][ E/K][A/G]LK[I/V]Q[A/V][E/D/G][I/M/V][A/V/S/T][E/D/K][E/D]; and

Motif 5 (SEQ ID NO: 42):

[V/L/A/F][V/T][V/I/A]Q[L/M]RDP[I/L/M/T]R[R/Q][Y/F]E[A/S/E]VG[G/A][P/T][V/M/L/ S][V/M/I][A/V][V/L/I][V/L/I][H/Q]A[T/V/E]; and

Motif A (SEQ ID NO: 43):

M[Q/H/N][K/R][L/M][S/G]CLFSVEVV[A/T/I][V/A][Q/E][G/N/D]LP[A/S]SMNGLRL[S

/A/G]V[C/A/S]VRKKET[K/R][D/E]G[A/S][V/M][N/Q/H/K]TMP[S/C]RV[S/D/A/H][Q/

L/H]G[A/S/G][G/A]DFEET[L/M]F[I/V/L][K/R][C/S][H/N][V/L/A]Y; and

Motif Ba (SEQ ID NO 45):

[K/R/T]FE[Q/P/A/S]R[P/V/L]F[F/W/M/S/L][I/L/V/F][Y/S][V/L/A][F/V][A/S]V[D/E]A[E /D/K/Q/P][A/E]L[D/E/S][F/L]GR[T/S/H/N][S/Y/I/L/A]VDLS[E/Q/L/R]L[I/V][Q/K/R]E S[I/V/M/T/S][E/D/G][K/R][S/N][Q/A/Y][E/Q][G/D][T/L/A/M/E]R[V/L]RQWD[T/M/R][

S/N/A][F/W/L][S/N/G/P/K]L[S/A]GKAKGGEL[V/A/I][L/V]KL[G/S/A]FQIM[E/D][K/D]

[E/D/G]G[G/V][I/V/A/G]

or alternatively Motif B (SEQ ID NO: 44):

[K/R/T]FE[Q/P/A/S]R[P/V/L]F[F/W/M/S/L][I/L/V/F][Y/S][V/L/A][F/V][A/S]V[D/E]A[E

/D/K/Q/P][A/E]L[D/E/S][F/L]GR[T/S/H/N][S/Y/I/L/A]VDLS[E/Q/L/R]L[I/V][Q/K/R]E

S[I/V/M/T/S][E/D/G][K/R]M[S/N][Q/A/Y][E/Q][G/D][T/L/A/M/E]R[V/L]RQWD[T/M/R

][S/N/A][F/W/L][S/N/G/P/K]L[S/A]GKAKGGEL[V/A/I][L/V]KL[G/S/A]FQIM[E/D][K/

D][E/D/G]G[G/V][I/V/A/G];

or

(ii) any 6 of the motifs listed under (i) ; or

(iii) any 5 of the motifs listed under (i); or

(iv) any 4 of the motifs listed under (i); or

(v) any 3 of the motifs listed under (i); or

(vi) Motifs 1 , 2, 3, 4 and 5 as described herein above; or

(vii) Motifs A and B as described herein above; or

(viii) any 4 of the motifs 1 , 2, 3, 4 and 5 as described herein above; or

(ix) Motifs 1 , 2 and 3 as described herein above; or

(x) Motifs 4 and 5 as described herein above; or

(xi) A combinations of (vi) and (vii) or (vii) and (ix) or (vii) and (x) above.

The method according to embodiment 7, wherein Motif 1 is replaced by motif 1*(SEQ ID NO: 46), motif 2 by motif 2* ( SEQ ID NO: 47), motif 3 by motif 3* ( SEQ ID NO: 48), motif 4 by motif 4* ( SEQ ID NO: 49), motif 5 by motif 5* ( SEQ ID NO: 50), motif A by motif A* ( SEQ ID NO: 51) and / or motif B by motif B* ( SEQ ID NO: 52).

Method according to any one of embodiments 1 to 8, wherein said nucleic acid encoding a PMP is of plant origin, preferably from a dicotyledonous plant, further preferably from a tree, more preferably from the genus Populus, most preferably from Populus trichocarpa.

Method according to any one of embodiments 1 to 9, wherein said nucleic acid encoding a PMP encodes any one of the polypeptides listed in Table A or is a portion of such a nucleic acid, or a nucleic acid capable of hybridising with a complementary sequence of such a nucleic acid.

Method according to any one of embodiments 1 to 10, wherein said nucleic acid sequence encodes an orthologue or paralogue of any of the polypeptides given in Table A.

Method according to any one of embodiments 1 to 1 1 , wherein said nucleic acid encodes the polypeptide represented by SEQ ID NO: 2. Method according to any one of embodiments 1 to 12, wherein said nucleic acid is operably linked to a constitutive promoter of plant origin, preferably to a medium strength constitutive promoter of plant origin, more preferably to a GOS2 promoter, most preferably to a GOS2 promoter from rice. Plant, or part thereof, or plant cell, obtainable by a method according to any one of embodiments 1 to 13, wherein said plant, plant part or plant cell comprises a recombinant nucleic acid encoding a PMP polypeptide as defined in any of embodiments 1 , 2, 4 and 7 to 13. Construct comprising:

(i) nucleic acid encoding an PMP as defined in any of embodiments 1 , 2, 4 and 7 to 13;

(ii) one or more control sequences capable of driving expression of the nucleic acid sequence of (i); and optionally

(iii) a transcription termination sequence. Construct according to embodiment 15, wherein one of said control sequences is a constitutive promoter of plant origin, preferably to a medium strength constitutive promoter of plant origin, more preferably to a GOS2 promoter, most preferably to a GOS2 promoter from rice. A host cell, preferably a bacterial host cell, more preferably an Agrobacterium species host cell comprising the construct according to any of embodiments 15 or 16 or the nucleic acid as defined in embodiment 4. Use of a construct according to embodiment 15 or 16 in a method for making plants having one or more enhanced yield-related traits, preferably increased yield relative to control plants, and more preferably increased seed yield and/or increased biomass relative to control plants. Plant, plant part or plant cell transformed with a construct according to embodiment 15 or 16. Method for the production of a transgenic plant having one or more enhanced yield- related traits relative to control plants, preferably increased yield relative to control plants, and more preferably increased seed yield and/or increased biomass relative to control plants, comprising:

(i) introducing and expressing in a plant cell or plant a nucleic acid encoding an

PMP polypeptide as defined in any of embodiments 1 , 2, 4 and 7 to 13; and (ii) cultivating said plant cell or plant under conditions promoting plant growth and development.

Method according to any one of embodiments 1 to 13 or 20, wherein said polypeptide is encoded by a nucleic acid molecule comprising a nucleic acid molecule selected from the group consisting of:

(i) a nucleic acid represented by (any one of) SEQ IDNO: 1 ;

(ii) the complement of a nucleic acid represented by (any one of) SEQ IDNO: 1 ;

(iii) a nucleic acid encoding the polypeptide as represented by (any one of) SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 OR 72, preferably SEQ ID NO: 2, and further preferably confers one or more enhanced yield-related traits relative to control plants;

(iv) a nucleic acid having, in increasing order of preference at least 30 %, 31 %, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41 %, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity with (any of) the nucleic acid sequences of SEQ IDNO: 1 , and further preferably conferring one or more enhanced yield-related traits relative to control plants;

(v) a nucleic acid molecule which hybridizes to the complement of a nucleic acid molecule of (i) to (iv) under stringent hybridization conditions and preferably confers one or more enhanced yield-related traits relative to control plants, ;

(vi) a nucleic acid encoding said polypeptide having, in increasing order of preference, at least 30 %, 31 %, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41 %, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to the amino acid sequence represented by (any one of) SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 OR 72, preferably SEQ ID NO: 2 and preferably conferring one or more enhanced yield-related traits relative to control plants; or

(vii) a nucleic acid comprising any combination(s) of features of (i) to (vi) above.

Transgenic plant having one or more enhanced yield-related traits relative to control plants, preferably increased yield relative to control plants, and more preferably increased seed yield and/or increased biomass, resulting from increased expression of a nucleic acid encoding an PMP polypeptide as defined in any of embodiments 1 , 2, 4 and 7 to 13 and 21 , or a transgenic plant cell derived from said transgenic plant. 23. Transgenic plant according to embodiment 14, 19 or 22, or a transgenic plant cell derived therefrom, wherein said plant is a crop plant, such as beet, sugarbeet or alfalfa; or a monocotyledonous plant such as sugarcane; or a cereal, such as rice, maize, wheat, barley, millet, rye, triticale, sorghum, emmer, spelt, einkorn, teff, milo or oats.

24. Harvestable part of a plant according to embodiment 14, 19, 22 or 23, wherein said harvestable parts comprise the construct according to embodiment 15 or 16 and are preferably shoot biomass and/or root biomass and/or seeds. 25. A product derived from a plant according to embodiment 14, 19 22 or 23 and/or from harvestable parts of a plant according to embodiment 23 and comprising the construct according to embodiment 15 or 16..

26. Use of a nucleic acid encoding an PMP polypeptide as defined in any of embodiments 1 , 2, 4 and 7 to 13 and 21 for enhancing one or more yield-related traits in plants relative to control plants, preferably for increasing yield , and more preferably for increasing seed yield and/or for increasing biomass in plants relative to control plants.

27. A method for manufacturing a product comprising the steps of growing the plants ac- cording to embodiment 14, 19, 22 or 23 and producing said product from or by said plants; or parts thereof, including seeds.

28. Recombinant chromosomal DNA comprising the construct according to embodiment 15 or 16.

29. Construct according to embodiment 15 or 16 or recombinant chromosomal DNA according to embodiment 28 comprised in a plant cell, preferably a crop plant cell.

30. Any of the embodiments 1 to 29 wherein the PMP polypeptide is not

a) Any of the polypeptides disclosed in the patent application US2007039067, published on 15th February 2007, and more preferably is not the sequences disclosed in said application as SEQ ID NO 19887; and/or

b) Any of the polypeptides disclosed in the patent application US2004031072, published on 12^th February 2004, and more preferably not the sequence disclosed as SEQ ID NO: 281286 of said patent application and/or as AFQ90109 in the Gene- seq database (status 19^th September 2012), available from Thomson Reuters, 3 Times Square, New York, NY 10036, USA; and/or

c) Any of the polypeptides disclosed in the patent application US200701 1783, published on 11^th January 2007, and more preferably not the sequence disclosed as SEQ ID NO: 52853 of said patent application and/or as ANO16009 in the Gene- seq database (status 19^th September 2012), available from Thomson Reuters, 3 Times Square, New York, NY 10036, USA. Additional embodiments:

I. A method for enhancing one or more yield-related traits in plants relative to control plants, comprising modulating, preferably increasing expression in a plant of a nucleic acid encoding a PMP polypeptide, wherein said PMP polypeptide comprises PFAM domain PF10358. I. Method according to embodiment I, wherein said PMP polypeptide is selected from the group consisting of:

(ii) an amino acid sequence having, in increasing order of preference, at least 25%,

30%, 35%, 40%, 45%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% se- quence identity to the amino acid sequence represented by SEQ ID NO: 2, 4, 6,

8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, over the entire length of the sequences represented by SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2, and further preferably conferring one or more enhanced yield-related traits relative to control plants.

III. Method according to embodiment I or II, wherein said modulated expression is effected by introducing and expressing in a plant said nucleic acid encoding said PMP poly- peptide.

IV. Method according to embodiment I, II or III, wherein said nucleic acid is selected from the group consisting of:

(i) a nucleic acid represented by SEQ ID NO: 1 , 3, 5, 7, 9, 11 , 13, 15, 17, 19, 21 , 23, 25, 27, 29, 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 ; preferably SEQ ID NO: 1 ,

53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 , more preferably SEQ ID NO: 1 ;

(iii) a nucleic acid encoding a POI polypeptide having in increasing order of preference at least 25%, 30%, 35%, 40%, 45%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to the entire amino acid sequence represented by SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2, and further preferably conferring one or more enhanced yield-related traits relative to control plants; and

Method according to any of embodiment I, II, III or IV, wherein said one or more enhanced yield-related traits comprise increased yield relative to control plants, and preferably comprise increased biomass and/or increased seed yield relative to control plants, and even more preferably comprise or consist of increased aboveground biomass, increased below-ground biomass, increased seed yield and/or increased sugar yield relative to control plants.

Method according to any of embodiments I to V, wherein said PMP polypeptide comprises

(i) all of the following motifs: Motif 1a (SEQ ID NO 35):

[M/V/I][P/A/G/S][L/I/M/T][D/E][E/D][L/M/V][L/I/V/M]GKT[A/G]E[Q/H][I/V]AFEG[I/M

T] AA[R/Q/E] [T/l/S/A] [l/V] [A/S/T]

or alternatively Motif 1 (SEQ ID NO: 34):

Motif 2 (SEQ ID NO: 36):

[V/N/I/C][Y/F][L/I/V][S/P][E/D]LGKG[L/I][G/S][C/P][V/L/I][V/I][Q/R]T[R/K][D/N]GG[ Y/F]L[A/V/T][A/S][T/M/L]NP[L/F][D/N][T/I/V/N][I/A/V/L/P][V/M][S/A/T/M/G/E][R/K][ K/N][D/E][T/A/L]PKL[A/V]MQ[L/I/M]S[K/R][P/A/Q][L/F/Y/I/M/V][V/I/L][L/V/F]; and

Motif 3b (SEQ ID NO: 39):

[S/K/E/L/V][K/E/S/A][G/D/E/S][K/Q/P/E/H/N][D/E][L/V/M/I/F/Q]LWS[I/L/M]SSR[I/V ][M/V]ADMWL[K/R][P/T/S/H][M/I/L]RNPD[V/I][K/N/I] or alternatively Motif 3 (SEQ ID NO: 37):

[S/K/E/L/V][K/E/S/A][G/D/E/S]QQ[K/Q/P/E/H/N][D/E][L/V/M/I/F/Q]LWS[I/L/M]SS

R[I/V][M/V]ADMWL[K/R][P/T/S/H][M/I/L]RNPD[V/I][K/N/I]

or alternatively Motif 3a (SEQ ID NO 38):

Motif 4a (SEQ ID NO: 41):

M[A/G/S][T/N/S/V][A/I/G][M/T/L/I][S/N/T][T/S/D/Y][G/S]R[K/Q/N][E/D]RI[S/T/A/M/

D][T/S]G[I/L]WN[V/M/I/A][N/D/E/S/H/Q][E/D][N/T/E/D/S]P[L/V/F]T[A/V/G/S][E/D][

K][A/G]LK[I/V]Q[A/V][E/D/G][I/M/V][A/V/S/T][E/D/K][E/D]

or alternatively Motif 4(SEQ ID NO: 40):

Motif 5 (SEQ ID NO: 42):

Motif A (SEQ ID NO: 43):

M[Q/H/N][K/R][L/M][S/G]CLFSVEVV[A/T/I][V/A][Q/E][G/N/D]LP[A/S]SMNGLRL[S

/A/G]V[C/A/S]VRKKET[K/R][D/E]G[A/S][V/M][N/Q/H/K]TMP[S/C]RV[S/D/A/H][Q/

L/H]G[A/S/G][G/A]DFEET[L/M]F[I/V/L][K/R][C/S][H/N][V/L/A]Y; and

Motif Ba (SEQ ID NO 45):

[K/R/T]FE[Q/P/A/S]R[P/V/L]F[F/W/M/S/L][I/L/V/F][Y/S][V/L/A][F/V][A/S]V[D/E]A[E

/D/K/Q/P][A/E]L[D/E/S][F/L]GR[T/S/H/N][S/Y/I/L/A]VDLS[E/Q/L/R]L[I/V][Q/K/R]E

S[I/V/M/T/S][E/D/G][K/R][S/N][Q/A/Y][E/Q][G/D][T/L/A/M/E]R[V/L]RQWD[T/M/R][

S/N/A][F/W/L][S/N/G/P/K]L[S/A]GKAKGGEL[V/A/I][L/V]KL[G/S/A]FQIM[E/D][K/D]

[E/D/G]G[G/V][I/V/A/G]

or alternatively Motif B (SEQ ID NO: 44):

[K/R/T]FE[Q/P/A/S]R[P/V/L]F[F/W/M/S/L][I/L/V/F][Y/S][V/L/A][F/V][A/S]V[D/E]A[E

/D/K/Q/P][A/E]L[D/E/S][F/L]GR[T/S/H/N][S/Y/I/L/A]VDLS[E/Q/L/R]L[I/V][Q/K/R]E

S[I/V/M/T/S][E/D/G][K/R]M[S/N][Q/A/Y][E/Q][G/D][T/L/A/M/E]R[V/L]RQWD[T/M/R ][S/N/A][F/W/L][S/N/G/P/K]L[S/A]GKAKGGEL[V/A/I][L/V]KL[G/S/A]FQIM[E/D][K/ D][E/D/G]G[G/V][I/V/A/G]; or

(ii) any 6 of the motifs listed under (i) ; or

(iii) any 5 of the motifs listed under (i); or

(iv) any 4 of the motifs listed under (i); or

(v) any 3 of the motifs listed under (i); or

(vi) Motifs 1 a, 2, 3b, 4a and 5 as described herein above; or

(vii) Motifs A and Ba as described herein above; or

(viii) any 4 of the motifs 1 a, 2, 3b, 4a and 5 as described herein above; or

(ix) Motifs 1a, 2 and 3b as described herein above; or

(x) Motifs 4a and 5 as described herein above; or

(xi) A combination of (vi) and (vii) or (vii) and (ix) or (vii) and (x) above.

VII. The method according to embodiment VI, wherein Motif 1 is replaced by motif 1 *(SEQ ID NO: 46), motif 2 by motif 2* ( SEQ ID NO: 47), motif 3 by motif 3* ( SEQ ID NO: 48), motif 4 by motif 4* ( SEQ ID NO: 49), motif 5 by motif 5* ( SEQ ID NO: 50), motif A by motif A* ( SEQ ID NO: 51) and / or motif B by motif B* ( SEQ ID NO: 52).

VIII. Method according to any one of embodiments I to VII, wherein said nucleic acid is op- erably linked to a constitutive promoter of plant origin, preferably to a medium strength constitutive promoter of plant origin, more preferably to a GOS2 promoter, most preferably to a GOS2 promoter from rice.

IX. Construct comprising:

(i) nucleic acid encoding an PMP as defined in any of embodiment I, II, IV, and VI to VIII;

(iii) a transcription termination sequence.

X. A host cell, preferably a bacterial host cell, more preferably an Agrobacterium species host cell comprising the construct according to embodiment IX or the nucleic acid as defined in embodiment IV.

XI. Use of a construct according to embodiment IX in a method for making plants having one or more enhanced yield-related traits, preferably increased yield relative to control plants, and more preferably increased seed yield and/or increased biomass relative to control plants. XII. Method for the production of a transgenic plant having one or more enhanced yield- related traits relative to control plants, preferably increased yield relative to control plants, and more preferably increased seed yield and/or increased biomass relative to control plants, comprising:

PMP polypeptide as defined in any of embodiment I, II, IV, and VI to VIII; and (ii) cultivating said plant cell or plant under conditions promoting plant growth and development. XIII. Plant, or part thereof, or plant cell, obtainable by a method according to any one of embodiments I to XII, wherein said plant, plant part or plant cell comprises a recombinant nucleic acid encoding a PMP polypeptide as defined in any of embodiment I, II, IV, and VI to VIII. XIV. Transgenic plant having one or more enhanced yield-related traits relative to control plants, preferably increased yield relative to control plants, and more preferably increased seed yield and/or increased biomass, resulting from modulated expression of a nucleic acid encoding an PMP polypeptide as defined in any of embodiment I, II, IV, and VI to VIII or a transgenic plant cell derived from said transgenic plant.

XV. Harvestable part of a plant according to embodiment XIII or XIV, wherein said har- vestable parts are preferably shoot biomass and/or root biomass and/or seeds and preferably comprises the construct of embodiment IX. XVI. Any of the embodiments I to XV wherein the PMP polypeptide is not

b) Any of the polypeptides disclosed in the patent application US2004031072, pub- lished on 12^th February 2004, and more preferably not the sequence disclosed as

SEQ ID NO: 281286 of said patent application and/or as AFQ90109 in the Gene- seq database (status 19^th September 2012), available from Thomson Reuters, 3 Times Square, New York, NY 10036, USA; and/or

c) Any of the polypeptides disclosed in the patent application US200701 1783, pub- lished on 1 1 ^th January 2007, and more preferably not the sequence disclosed as

SEQ ID NO: 52853 of said patent application and/or as ANO16009 in the Gene- seq database (status 19^th September 2012), available from Thomson Reuters, 3 Times Square, New York, NY 10036, USA. Definitions The following definitions will be used throughout the present application. The section captions and headings in this application are for convenience and reference purpose only and should not affect in any way the meaning or interpretation of this application. The technical terms and expressions used within the scope of this application are generally to be given the meaning commonly applied to them in the pertinent art of plant biology, molecular biology, bioinformatics and plant breeding. All of the following term definitions apply to the complete content of this application. It is to be understood that as used in the specification and in the claims, "a" or "an" can mean one or more, depending upon the context in which it is used. Thus, for example, reference to "a cell" can mean that at least one cell can be utilized. The term "essentially", "about", "approximately" and the like in connection with an attribute or a value, particularly also define exactly the attribute or exactly the value, respectively. The term "about" in the context of a given numeric value or range relates in particular to a value or range that is within 20%, within 10%, or within 5% of the value or range given. As used herein, the term "comprising" also encompasses the term "consisting of.

Peptide(s)/Protein(s)

The terms "peptides", "oligopeptides", "polypeptide" and "protein" are used interchangeably herein and refer to amino acids in a polymeric form of any length, linked together by peptide bonds, unless mentioned herein otherwise.

Polynucleotide(s)/Nucleic acid(s)/Nucleic acid sequence(s)/nucleotide sequence(s)

The terms "polynucleotide(s)", "nucleic acid sequence(s)", "nucleotide sequence(s)", "nucleic acid(s)", "nucleic acid molecule" are used interchangeably herein and refer to nucleotides, either ribonucleotides or deoxyribonucleotides or a combination of both, in a polymeric un- branched form of any length.

The term "nucleotide" refers to a nucleic acid building block consisting of a nucleobase, a pentose and at least one phosphate group. Thus, the term "nucleotide" includes a nukleo- sidmonophosphate, nukleosiddiphosphate, and nukleosidtriphosphate. Homologue(s)

"Homologues" of a protein encompass peptides, oligopeptides, polypeptides, proteins and enzymes having amino acid substitutions, deletions and/or insertions relative to the unmodified protein in question and having substantially the same and functional activity as the unmodified protein from which they are derived.

"Homologues" of a gene encompass nucleic acid sequences with nucleotide substitutions, deletions and/or insertions relative to the unmodified gene in question and having substantially the same activity and/or functional properties as the unmodified gene from which they are derived, or encoding polypeptides having substantially the same biological and/or func- tional activity as the polypeptide encoded by the unmodified nucleic acid sequence Orthologues and paralogues are two different forms of homologues and encompass evolutionary concepts used to describe the ancestral relationships of genes or proteins. Paralogues are genes or proteins within the same species that have originated through duplication of an ancestral gene; orthologues are genes or proteins from different organisms that have originated through speciation, and are also derived from a common ancestral gene.

A "deletion" refers to removal of one or more amino acids from a protein or a removal of one or more nucleotides from a nucleic acid.. An "insertion" refers to one or more amino acid residues being introduced into a predetermined site in a protein or to one or more nucleotides being introduced into a predetermined site in a nucleic acid sequence. Regarding a protein, insertions may comprise N-terminal and/or C-terminal fusions as well as intra-sequence insertions of single or multiple amino acids. Generally, insertions within the amino acid sequence will be smaller than N- or C- terminal fusions, of the order of about 1 to 10 residues. Examples of N- or C-terminal fusion proteins or peptides include the binding domain or activation domain of a transcriptional activator as used in the yeast two-hybrid system, phage coat proteins, (histidine)-6-tag, glutathione S-transferase-tag, protein A, maltose-binding protein, dihydrofolate reductase, Tag^»100 epitope, c-myc epitope, FLAG^®-epitope, lacZ, CMP (calmodulin-binding peptide), HA epitope, protein C epitope and VSV epitope.

A "substitution" refers to replacement of amino acids of the protein with other amino acids having similar properties (such as similar hydrophobicity, hydrophilicity, antigenicity, propensity to form or break a-helical structures or β-sheet structures). Amino acid substitutions are typically of single residues, but may be clustered depending upon functional constraints placed upon the polypeptide. The amino acid substitutions are preferably conservative amino acid substitutions. Conservative substitution tables are well known in the art (see for example Creighton (1984) Proteins. W.H. Freeman and Company (Eds) and Table 1 below). Table 1 : Examples of conserved amino acid substitutions

Residue Conservative Substitutions Residue Conservative Substitutions

Ala Ser Leu lie; Val

Arg Lys Lys Arg; Gin

Asn Gin; His Met Leu; lie

Asp Glu Phe Met; Leu; Tyr

Gin Asn Ser Thr; Gly

Cys Ser Thr Ser; Val

Glu Asp Trp Tyr

Gly Pro Tyr Trp; Phe

His Asn; Gin Val lie; Leu

He Leu, Val Amino acid substitutions, deletions and/or insertions may readily be made using peptide synthetic techniques known in the art, such as solid phase peptide synthesis and the like, or by recombinant DNA manipulation. Methods for the manipulation of DNA sequences to pro- duce substitution, insertion or deletion variants of a protein are well known in the art. For example, techniques for making substitution mutations at predetermined sites in DNA are well known to those skilled in the art and include M13 mutagenesis, T7-Gen in vitro mutagenesis (USB, Cleveland, OH), QuickChange Site Directed mutagenesis (Stratagene, San Diego, CA), PCR-mediated site-directed mutagenesis or other site-directed mutagenesis protocols (see Current Protocols in Molecular Biology, John Wiley & Sons, N.Y. (1989 and yearly updates)).

Derivatives

"Derivatives" include peptides, oligopeptides, polypeptides which may, compared to the amino acid sequence of the naturally-occurring form of the protein, such as the protein of interest, comprise substitutions of amino acids with non-naturally occurring amino acid residues, or additions of non-naturally occurring amino acid residues. "Derivatives" of a protein also encompass peptides, oligopeptides, polypeptides which comprise naturally occurring altered (glycosylated, acylated, prenylated, phosphorylated, myristoylated, sulphated etc.) or non-naturally altered amino acid residues compared to the amino acid sequence of a naturally-occurring form of the polypeptide. A derivative may also comprise one or more non-amino acid substituents or additions compared to the amino acid sequence from which it is derived, for example a reporter molecule or other ligand, covalently or non-covalently bound to the amino acid sequence, such as a reporter molecule which is bound to facilitate its detection, and non-naturally occurring amino acid residues relative to the amino acid sequence of a naturally-occurring protein. Furthermore, "derivatives" also include fusions of the naturally-occurring form of the protein with tagging peptides such as FLAG, HIS6 or thi- oredoxin (for a review of tagging peptides, see Terpe, Appl. Microbiol. Biotechnol. 60, 523- 533, 2003).

"Derivatives" of nucleic acids include nucleic acids which may, compared to the nucleotide sequence of the naturally-occurring form of the nucleic acid comprise deletions, alterations, or additions with non-naturally occurring nucleotides. These may be naturally occurring altered or non-naturally altered nucleotides as compared to the nucleotide sequence of a naturally-occurring form of the nucleic acid. A derivative of a protein or nucleic acid still pro- vides substantially the same function, e.g., enhanced yield-related trait, when expressed or repressed in a plant respectively.

Functional fragments

The term "functional fragment" refers to any nucleic acid or protein which comprises merely a part of the fulllength nucleic acid or fulllength protein, respectively, but still provides substantially the same function e.g. enhanced yield-related trait(s) when overexpressed or repressed in a plant respectively. In cases where overexpression of nucleic acid is desired, the term "substantially the same functional activity" or "substantially the same function" means that any homologue and/or fragment provide increased / enhanced yield-related trait(s) when expressed in a plant. Preferably substantially the same functional activity or substantially the same function means at least 50%, at least 60%, at least 70%, at least 80 %, at least 90 %, at least 95%, at least 98 %, at least 99% or 100% or higher increased / enhanced yield-related trait(s) compared with the functional activity provided by the exogenous expression of the full- length PMP encoding nucleotide sequence or the PMP amino acid sequence. Domain, Motif/Consensus sequence/Signature

The term "domain" refers to a set of amino acids conserved at specific positions along an alignment of sequences of evolutionarily related proteins. While amino acids at other positions can vary between homologues, amino acids that are highly conserved at specific positions indicate amino acids that are likely essential in the structure, stability or function of a protein. Identified by their high degree of conservation in aligned sequences of a family of protein homologues, they can be used as identifiers to determine if any polypeptide in question belongs to a previously identified polypeptide family.

The term "motif" or "consensus sequence" or "signature" refers to a short conserved region in the sequence of evolutionarily related amino acid or nucleic acid sequences. For amino acid sequences motifs are frequently highly conserved parts of domains, but may also include only part of the domain, or be located outside of conserved domain (if all of the amino acids of the motif fall outside of a defined domain). Specialist databases exist for the identification of domains, for example, SMART (Schultz et al. (1998) Proc. Natl. Acad. Sci. USA 95, 5857-5864; Letunic et al. (2002) Nucleic Acids Res 30, 242-244), InterPro (Mulder et al., (2003) Nucl. Acids. Res. 31 , 315-318), Prosite (Bucher and Bairoch (1994), A generalized profile syntax for biomolecular sequences motifs and its function in automatic sequence interpretation. (In) ISMB-94; Proceedings 2nd Inter- national Conference on Intelligent Systems for Molecular Biology. Altman R., Brutlag D., Karp P., Lathrop R., Searls D., Eds., pp53-61 , AAAI Press, Menlo Park; Hulo et al., Nucl. Acids. Res. 32:D134-D137, (2004)), or Pfam (Bateman et al., Nucleic Acids Research 30(1 ): 276-280 (2002) ) & The Pfam protein families database: R.D. Finn, J. Mistry, J. Tate, P. Coggill, A. Heger, J.E. Pollington, O.L. Gavin, P. Gunesekaran, G. Ceric, K. Forslund, L. Holm, E.L. Sonnhammer, S.R. Eddy, A. Bateman Nucleic Acids Research (2010) Database Issue 38:21 1 -222). A set of tools for in silico analysis of protein sequences is available on the ExPASy proteomics server (Swiss Institute of Bioinformatics (Gasteiger et al., ExPASy: the proteomics server for in-depth protein knowledge and analysis, Nucleic Acids Res. 31 :3784-3788(2003)). Domains or motifs may also be identified using routine techniques, such as by sequence alignment. Methods for the alignment of sequences for comparison are well known in the art, such methods include GAP, BESTFIT, BLAST, FASTA and TFASTA. GAP uses the algorithm of Needleman and Wunsch ((1970) J Mol Biol 48: 443-453) to find the global (i.e. spanning the complete sequences) alignment of two sequences that maximizes the number of matches and minimizes the number of gaps. The BLAST algorithm (Altschul et al. (1990) J Mol Biol 215: 403-10) calculates percent sequence identity and performs a statistical analysis of the similarity between the two sequences. The software for performing BLAST analysis is publicly available through the National Centre for Biotechnology Information (NCBI). Homo- logues may readily be identified using, for example, the ClustalW multiple sequence align- ment algorithm (version 1.83), with the default pairwise alignment parameters, and a scoring method in percentage. Global percentages of similarity and identity may also be determined using one of the methods available in the MatGAT software package (Campanella et al., BMC Bioinformatics. 2003 Jul 10;4:29. MatGAT: an application that generates similarity/identity matrices using protein or DNA sequences.). Minor manual editing may be per- formed to optimise alignment between conserved motifs, as would be apparent to a person skilled in the art. Furthermore, instead of using full-length sequences for the identification of homologues, specific domains may also be used. The sequence identity values may be determined over the entire nucleic acid or amino acid sequence or over selected domains or conserved motif(s), using the programs mentioned above using the default parameters. For local alignments, the Smith-Waterman algorithm is particularly useful (Smith TF, Waterman MS (1981) J. Mol. Biol 147(1 );195-7).

Reciprocal BLAST

Typically, this involves a first BLAST involving BLASTing (i.e. running the BLAST software with the sequence of interest as query sequence) a query sequence (for example using any of the sequences listed in Table A of the Examples section) against any sequence database, such as the publicly available NCBI database. BLASTN or TBLASTX (using standard default values) are generally used when starting from a nucleotide sequence, and BLASTP or TBLASTN (using standard default values) when starting from a protein sequence. The BLAST results may optionally be filtered. The full-length sequences of either the filtered results or non-filtered results are then BLASTed back (second BLAST) against sequences from the organism from which the query sequence is derived. The results of the first and second BLASTs are then compared. A paralogue is identified if a high-ranking hit from the first blast is from the same species as from which the query sequence is derived, a BLAST back then ideally results in the query sequence amongst the highest hits; an orthologue is identified if a high-ranking hit in the first BLAST is not from the same species as from which the query sequence is derived, and preferably results upon BLAST back in the query sequence being among the highest hits. High-ranking hits are those having a low E-value. The lower the E-value, the more significant the score (or in other words the lower the chance that the hit was found by chance). Computation of the E-value is well known in the art. In addition to E-values, comparisons are also scored by percentage identity. Percentage identity refers to the number of identical nucleotides (or amino acids) between the two compared nucleic acid (or polypeptide) sequences over a particular length. In the case of large families, ClustalW may be used, followed by a neighbour joining tree, to help visualize clustering of related genes and to identi- fy orthologues and paralogues.

Transit peptide

A "transit peptide" (or transit signal, signal peptide, signal sequence) is a short (3-60 amino acids long) peptide chain that directs the transport of a protein, preferably to organelles within the cell or to certain subcellular locations or for the secretion of a protein. Transit peptides may also be called transit signal, signal peptide, signal sequence, targeting signals, or (subcellular) localization signals.

Hybridisation

The term "hybridisation" as defined herein is a process wherein substantially homologous complementary nucleotide sequences anneal to each other. The hybridisation process can occur entirely in solution, i.e. both complementary nucleic acids are in solution. The hybridisation process can also occur with one of the complementary nucleic acids immobilised to a matrix such as magnetic beads, Sepharose beads or any other resin. The hybridisation pro- cess can furthermore occur with one of the complementary nucleic acids immobilised to a solid support such as a nitro-cellulose or nylon membrane or immobilised by e.g. photolithography to, for example, a siliceous glass support (the latter known as nucleic acid arrays or microarrays or as nucleic acid chips). In order to allow hybridisation to occur, the nucleic acid molecules are generally thermally or chemically denatured to melt a double strand into two single strands and/or to remove hairpins or other secondary structures from single stranded nucleic acids.

The term "stringency" refers to the conditions under which a hybridisation takes place. The stringency of hybridisation is influenced by conditions such as temperature, salt concentra- tion, ionic strength and hybridisation buffer composition. Generally, low stringency conditions are selected to be about 30°C lower than the thermal melting point (T_m) for the specific sequence at a defined ionic strength and pH. Medium stringency conditions are when the temperature is 20°C below T_m, and high stringency conditions are when the temperature is 10°C below T_m. High stringency hybridisation conditions are typically used for isolating hy- bridising sequences that have high sequence similarity to the target nucleic acid sequence. However, nucleic acids may deviate in sequence and still encode a substantially identical polypeptide, due to the degeneracy of the genetic code. Therefore medium stringency hybridisation conditions may sometimes be needed to identify such nucleic acid molecules. The Tm is the temperature under defined ionic strength and pH, at which 50% of the target sequence hybridises to a perfectly matched probe. The T_m is dependent upon the solution conditions and the base composition and length of the probe. For example, longer se- quences hybridise specifically at higher temperatures. The maximum rate of hybridisation is obtained from about 16°C up to 32°C below T_m. The presence of monovalent cations in the hybridisation solution reduce the electrostatic repulsion between the two nucleic acid strands thereby promoting hybrid formation; this effect is visible for sodium concentrations of up to 0.4M (for higher concentrations, this effect may be ignored). Formamide reduces the melting temperature of DNA-DNA and DNA-RNA duplexes with 0.6 to 0.7°C for each percent formamide, and addition of 50% formamide allows hybridisation to be performed at 30 to 45°C, though the rate of hybridisation will be lowered. Base pair mismatches reduce the hybridisation rate and the thermal stability of the duplexes. On average and for large probes, the Tm decreases about 1 °C per % base mismatch. The T_m may be calculated using the following equations, depending on the types of hybrids:

1 ) DNA-DNA hybrids (Meinkoth and Wahl, Anal. Biochem., 138: 267-284, 1984):

T_m= 81.5°C + 16.6xlogio[Na⁺]^a + 0.41x%[G/C^b] - 500x[L^c]-¹ - 0.61 x% formamide 2) DNA-RNA or RNA-RNA hybrids:

T_m= 79.8°C+ 18.5 (logio[Na⁺]^a) + 0.58 (%G/C^b) + 1 1.8 (%G/C^b)² - 820/L^c

3) oligo-DNA or oligo-RNA^d hybrids:

For <20 nucleotides: T_m= 2 (l_n)

For 20-35 nucleotides: T_m= 22 + 1.46 (l_n)

a or for other monovalent cation, but only accurate in the 0.01-0.4 M range.

b only accurate for %GC in the 30% to 75% range.

c L = length of duplex in base pairs.

d oligo, oligonucleotide; l_n, = effective length of primer = 2x(no. of G/C)+(no. of A/T). Non-specific binding may be controlled using any one of a number of known techniques such as, for example, blocking the membrane with protein containing solutions, additions of heterologous RNA, DNA, and SDS to the hybridisation buffer, and treatment with Rnase. For non-homologous probes, a series of hybridizations may be performed by varying one of (i) progressively lowering the annealing temperature (for example from 68°C to 42°C) or (ii) progressively lowering the formamide concentration (for example from 50% to 0%). The skilled artisan is aware of various parameters which may be altered during hybridisation and which will either maintain or change the stringency conditions.

Besides the hybridisation conditions, specificity of hybridisation typically also depends on the function of post-hybridisation washes. To remove background resulting from nonspecific hybridisation, samples are washed with dilute salt solutions. Critical factors of such washes include the ionic strength and temperature of the final wash solution: the lower the salt concentration and the higher the wash temperature, the higher the stringency of the wash. Wash conditions are typically performed at or below hybridisation stringency. A posi- tive hybridisation gives a signal that is at least twice of that of the background. Generally, suitable stringent conditions for nucleic acid hybridisation assays or gene amplification detection procedures are as set forth above. More or less stringent conditions may also be selected. The skilled artisan is aware of various parameters which may be altered during washing and which will either maintain or change the stringency conditions.

For example, typical high stringency hybridisation conditions for DNA hybrids longer than 50 nucleotides encompass hybridisation at 65°C in 1x SSC or at 42°C in 1x SSC and 50% formamide, followed by washing at 65°C in 0.3x SSC. Examples of medium stringency hybridisation conditions for DNA hybrids longer than 50 nucleotides encompass hybridisation at 50°C in 4x SSC or at 40°C in 6x SSC and 50% formamide, followed by washing at 50°C in 2x SSC. The length of the hybrid is the anticipated length for the hybridising nucleic acid. When nucleic acids of known sequence are hybridised, the hybrid length may be determined by aligning the sequences and identifying the conserved regions described herein. 1 xSSC is 0.15M NaCI and 15mM sodium citrate; the hybridisation solution and wash solutions may additionally include 5x Denhardt's reagent, 0.5-1.0% SDS, 100 μg/ml denatured, fragmented salmon sperm DNA, 0.5% sodium pyrophosphate. In a preferred embodiment high stringency conditions mean hybridisation at 65°C in 0.1x SSC comprising 0.1 SDS and optionally 5x Denhardt's reagent, 100 μg/ml denatured, fragmented salmon sperm DNA, 0.5% sodium pyrophosphate, followed by the washing at 65°C in 0.3x SSC.

For the purposes of defining the level of stringency, reference can be made to Sambrook et al. (2001) Molecular Cloning: a laboratory manual, 3^rd Edition, Cold Spring Harbor Laboratory Press, CSH, New York or to Current Protocols in Molecular Biology, John Wiley & Sons, N.Y. (1989 and yearly updates).

Splice variant

The term "splice variant" as used herein encompasses variants of a nucleic acid sequence in which selected introns and/or exons have been excised, replaced, displaced or added, or in which introns have been shortened or lengthened. Such variants will be ones in which the biological activity of the protein is substantially retained; this may be achieved by selectively retaining functional segments of the protein. Such splice variants may be found in nature or may be manmade. Methods for predicting and isolating such splice variants are well known in the art (see for example Foissac and Schiex (2005) BMC Bioinformatics 6: 25).

Allelic variant

"Alleles" or "allelic variants" are alternative forms of a given gene, located at the same chromosomal position. Allelic variants encompass Single Nucleotide Polymorphisms

(SNPs), as well as Small Insertion/Deletion Polymorphisms (INDELs). The size of INDELs is usually less than 100 bp. SNPs and INDELs form the largest set of sequence variants in naturally occurring polymorphic strains of most organisms.

Endogenous

Reference herein to an "endogenous" nucleic acid and / or protein refers to the nucleic acid and / or protein in question as found in a plant in its natural form (i.e., without there being any human intervention like recombinant DNA technology), but also refers to that same gene (or a substantially homologous nucleic acid/gene) in an isolated form subsequently (re)introduced into a plant (a transgene). For example, a transgenic plant containing such a transgene may encounter a substantial reduction of the transgene expression and/or sub- stantial reduction of expression of the endogenous gene. The isolated gene may be isolated from an organism or may be manmade, for example by chemical synthesis.

Exogenous

The term "exogenous" (in contrast to "endogenous") nucleic acid or gene refers to a nucleic acid that has been introduced in a plant by means of recombinant DNA technology. An "exogenous" nucleic acid can either not occur in this plant in its natural form, be different from the nucleic acid in question as found in the plant in its natural form, or can be identical to a nucleic acid found in the plant in its natural form, but not integrated within its natural genetic environment. The corresponding meaning of "exogenous" is applied in the context of protein expression. For example, a transgenic plant containing a transgene, i.e., an exogenous nucleic acid, may, when compared to the expression of the endogenous gene, encounter a substantial increase of the expression of the respective gene or protein in total. A transgenic plant according to the present invention includes an exogenous PMP nucleic acid integrated at any genetic loci and optionally the plant may also include the endogenous gene within the natural genetic background.

Gene shuffling/Directed evolution

"Gene shuffling" or "directed evolution" consists of iterations of DNA shuffling followed by appropriate screening and/or selection to generate variants of nucleic acids or portions thereof encoding proteins having a modified biological activity (Castle et al., (2004) Science 304(5674): 1 151 -4; US patents 5,81 1 ,238 and 6,395,547).

Expression cassette

"Expression cassette" as used herein is DNA capable of being expressed in a host cell or in an in-vitro expression system. Preferably the DNA, part of the DNA or the arrangement of the genetic elements forming the expression cassette is artificial. The skilled artisan is well aware of the genetic elements that must be present in the expression cassette in order to be successfully expressed. The expression cassette comprises a sequence of interest to be expressed operably linked to one or more control sequences (at least to a promoter) as de- scribed herein. Additional regulatory elements may include transcriptional as well as trans- lational enhancers, one or more NEENA as described herein, and/or one or more RENA as described herein. Those skilled in the art will be aware of terminator and enhancer sequences that may be suitable for use in performing the invention. An intron sequence may also be added to the 5' untranslated region (UTR) or in the coding sequence to increase the amount of the mature message that accumulates in the cytosol, as described in the definitions section for increased expression/overexpression. Other control sequences (besides promoter, enhancer, silencer, intron sequences, 3'UTR and/or 5'UTR regions) may be pro- tein and/or RNA stabilizing elements. Such sequences would be known or may readily be obtained by a person skilled in the art.

The expression cassette may be integrated into the genome of a host cell and replicated together with the genome of said host cell.

Construct / genetic construct

This is DNA - artificial in part or total or artificial in the arrangement of the genetic elements contained - capable of increasing or decreasing the expression of DNA and/or protein of interest typically by replication in a host cell and used for introduction of a DNA sequence of interest into a host cell or host organism. Replication may occur after integration into the host cell's genome or through the presence of the construct as part of a vector or an artificial chromosome inside the host cell.

Host cells of the invention may be any cell selected from bacterial cells, such as Escherich- ia coli or Agrobacterium species cells, yeast cells, fungal, algal or cyanobacterial cells or plant cells. The skilled artisan is well aware of the genetic elements that must be present on the genetic construct in order to successfully transform, select and propagate host cells containing the sequence of interest. Typically the construct / genetic construct is an expression construct and comprises one or more expression cassettes that may lead to overexpression (overexpression construct) or reduced expression of a gene of interest. A construct may consist of an expression cassette. The sequence(s) of interest is/are operably linked to one or more control sequences (at least to a promoter) as described herein. Additional regulatory elements may include transcriptional as well as translational enhancers, one or more NEENA as described herein, and/or one or more RENA as described herein. Those skilled in the art will be aware of terminator and enhancer sequences that may be suitable for use in performing the invention. An intron sequence may also be added to the 5' untranslated region (UTR) or in the coding sequence to increase the amount of the mature message that accumulates in the cytosol, as described in the definitions section for increased expression/overexpression. Other control sequences (besides promoter, enhancer, silencer, intron sequences, 3'UTR and/or 5'UTR regions) may be protein and/or RNA stabilizing elements. Such sequences would be known or may readily be obtained by a person skilled in the art. The genetic constructs of the invention may further include an origin of replication sequence that is required for maintenance and/or replication in a specific cell type. One example is when a genetic construct is required to be maintained in a bacterial cell as an episomal genetic element (e.g. plasmid or cosmid molecule). Preferred origins of replication include, but are not limited to, the f1 -oh and colE1.

For the detection of the successful transfer of the nucleic acid sequences as used in the methods of the invention and/or selection of transgenic plants comprising these nucleic ac- ids, it is advantageous to use marker genes (or reporter genes). Therefore, the genetic construct may optionally comprise a selectable marker gene. Selectable markers are described in more detail in the "definitions" section herein. The marker genes may be removed or excised from the transgenic cell once they are no longer needed. Techniques for marker re- moval are known in the art, useful techniques are described above in the definitions section.

Vector construct/ vector

This is DNA (such as but, not limited to plasmids or viral DNA) - artificial in part or total or artificial in the arrangement of the genetic elements contained - capable of replication in a host cell and used for introduction of a DNA sequence of interest into a host cell or host organism. A vector may be a construct or may comprise at least one construct. A vector may replicate without integrating into the genome of a host cell, e.g. a plasmid vector in a bacterial host cell, or it may integrate part or all of its DNA into the genome of the host cell and thus lead to replication and expression of its DNA. Host cells of the invention may be any cell selected from bacterial cells, such as Escherichia coli or Agrobacterium species cells, yeast cells, fungal, algal or cyanobacterial cells or plant cells. The skilled artisan is well aware of the genetic elements that must be present on the genetic construct in order to successfully transform, select and propagate host cells containing the sequence of interest. Typically the vector comprises at least one expression cassette. The one or more se- quence(s) of interest is operably linked to one or more control sequences (at least to a promoter) as described herein. Additional regulatory elements may include transcriptional as well as translational enhancers, one or more NEENA as described herein and/or one or more RENA as described herein. Those skilled in the art will be aware of terminator and enhancer sequences that may be suitable for use in performing the invention. An intron se- quence may also be added to the 5' untranslated region (UTR) or in the coding sequence to increase the amount of the mature message that accumulates in the cytosol, as described in the definitions section. Other control sequences (besides promoter, enhancer, silencer, intron sequences, 3'UTR and/or 5'UTR regions) may be protein and/or RNA stabilizing elements. Such sequences would be known or may readily be obtained by a person skilled in the art.

Regulatory element/Control sequence/Promoter

The terms "regulatory element", "control sequence" and "promoter" are all used interchangeably herein and are to be taken in a broad context to refer to regulatory nucleic acid sequences capable of effecting expression of the sequences to which they are associated. The term "promoter" or "promoter sequence" typically refers to a nucleic acid control sequence located upstream from the transcriptional start of a gene and which is involved in recognising and binding of RNA polymerase and other proteins, thereby directing transcription of an operably linked nucleic acid. Encompassed by the aforementioned terms are transcriptional regulatory sequences derived from a classical eukaryotic genomic gene (including the TATA box which is required for accurate transcription initiation, with or without a CCAAT box sequence) and additional regulatory elements (i.e. upstream activating se- quences, enhancers and silencers) which alter gene expression in response to developmental and/or external stimuli, or in a tissue-specific manner. Also included within the term is a transcriptional regulatory sequence of a classical prokaryotic gene, in which case it may include a -35 box sequence and/or -10 box transcriptional regulatory sequences. The term "regulatory element" also encompasses a synthetic fusion molecule or derivative that confers, activates or enhances expression of a nucleic acid molecule in a cell, tissue or organ.

A "plant promoter" comprises regulatory elements, which mediate the expression of a coding sequence segment in plant cells. Accordingly, a plant promoter need not be of plant origin, but may originate from viruses or micro-organisms, for example from viruses which attack plant cells. The "plant promoter" can also originate from a plant cell, e.g. from the plant which is transformed with the nucleic acid sequence to be expressed in the inventive process and described herein. This also applies to other "plant" regulatory signals, such as "plant" terminators. The promoters upstream of the nucleotide sequences useful in the methods of the present invention can be modified by one or more nucleotide substitution(s), insertion(s) and/or deletion(s) without interfering with the functionality or activity of either the promoters, the open reading frame (ORF) or the 3'-regulatory region such as terminators or other 3' regulatory regions which are located away from the ORF. It is furthermore possible that the activity of the promoters is increased by modification of their sequence, or that they are replaced completely by more active promoters, even promoters from heterologous organisms. For expression in plants, the nucleic acid molecule must, as described herein, be linked operably to or comprise a suitable promoter which expresses the gene at the right point in time and with the required spatial expression pattern. For the identification of functionally equivalent promoters, the promoter strength and/or expression pattern of a candidate promoter may be analysed for example by operably linking the promoter to a reporter gene and assaying the expression level and pattern of the reporter gene in various tissues of the plant. Suitable well-known reporter genes include for example beta-glucuronidase or beta-galactosidase. The promoter activity is assayed by measuring the enzymatic activity of the beta-glucuronidase or beta-galactosidase. The promoter strength and/or expression pattern may then be compared to that of a reference promoter (such as the one used in the methods of the present invention). Alternatively, promoter strength may be assayed by quantifying mRNA levels or by comparing mRNA levels of the nucleic acid used in the methods of the present invention, with mRNA levels of housekeeping genes such as 18S rRNA, using methods known in the art, such as Northern blotting with densitometric analysis of autoradiograms, quantitative real-time PCR or RT- PCR (Heid et al., 1996 Genome Methods 6: 986-994). Generally by "weak promoter" is intended a promoter that drives expression of a coding sequence at a low level. By "low level" is intended at levels of about 1/10,000 transcripts to about 1/100,000 transcripts, to about 1/500,0000 transcripts per cell. Conversely, a "strong promoter" drives expression of a coding sequence at high level, or at about 1/10 transcripts to about 1/100 transcripts to about 1/1000 transcripts per cell. Generally, by "medium strength promoter" is intended a promot- er that drives expression of a coding sequence at a lower level than a strong promoter, in particular at a level that is in all instances below that obtained when under the control of a 35S CaMV promoter. Operably linked

The term "operably linked" or "functionally linked" is used interchangeably and, as used herein, refers to a functional linkage between the promoter sequence and the gene of interest, such that the promoter sequence is able to direct transcription of the gene of interest. The term "functional linkage" or "functionally linked" with respect to regulatory elements, is to be understood as meaning, for example, the sequential arrangement of a regulatory element (e.g. a promoter) with a nucleic acid sequence to be expressed and, if appropriate, further regulatory elements (such as e.g., a terminator, NEENA as described herein or a RENA as described herein) in such a way that each of the regulatory elements can fulfil its intended function to allow, modify, facilitate or otherwise influence expression of said nucleic acid sequence. As a synonym the wording "operable linkage" or "operably linked" may be used. The expression may result, depending on the arrangement of the nucleic acid sequences, in sense or antisense RNA. To this end, direct linkage in the chemical sense is not necessarily required. Genetic control sequences such as, for example, enhancer se- quences, can also exert their function on the target sequence from positions which are further away, or indeed from other DNA molecules. Preferred arrangements are those in which the nucleic acid sequence to be expressed recombinantly is positioned behind the sequence acting as promoter, so that the two sequences are linked covalently to each other. The distance between the promoter sequence and the nucleic acid sequence to be ex- pressed recombinantly is preferably less than 200 base pairs, especially preferably less than 100 base pairs, very especially preferably less than 50 base pairs. In a preferred embodiment, the nucleic acid sequence to be transcribed is located behind the promoter in such a way that the transcription start is identical with the desired beginning of the RNA of the invention. Functional linkage, and an expression construct, can be generated by means of customary recombination and cloning techniques as described (e.g., in Maniatis T,

Fritsch EF and Sambrook J (1989) Molecular Cloning: A Laboratory Manual, 2nd Ed., Cold Spring Harbor Laboratory, Cold Spring Harbor (NY); Silhavy et al. (1984) Experiments with Gene Fusions, Cold Spring Harbor Laboratory, Cold Spring Harbor (NY); Ausubel et al. (1987) Current Protocols in Molecular Biology, Greene Publishing Assoc. and Wiley Inter- science; Gelvin et al. (Eds) (1990) Plant Molecular Biology Manual; Kluwer Academic Publisher, Dordrecht, The Netherlands). However, further sequences, which, for example, act as a linker with specific cleavage sites for restriction enzymes, or as a signal peptide, may also be positioned between the two sequences. The insertion of sequences may also lead to the expression of fusion proteins. Preferably, the expression construct, consisting of a linkage of a regulatory region for example a promoter and nucleic acid sequence to be expressed, can exist in a vector-integrated form and be inserted into a plant genome, for example by transformation. Constitutive promoter

A "constitutive promoter" refers to a promoter that is transcriptionally active during most, but not necessarily all, phases of growth and development and under most environmental con- ditions, in at least one cell, tissue or organ. Table 2a below gives examples of constitutive promoters.

Table 2a: Examples of constitutive promoters

Ubiquitous promoter

A "ubiquitous promoter" is active in substantially all tissues or cells of an organism.

Developmentally-regulated promoter

A "developmentally-regulated promoter" is active during certain developmental stages or in parts of the plant that undergo developmental changes.

Inducible promoter

An "inducible promoter" has induced or increased transcription initiation in response to a chemical (for a review see Gatz 1997, Annu. Rev. Plant Physiol. Plant Mol. Biol., 48:89- 108), environmental or physical stimulus, or may be "stress-inducible", i.e. activated when a plant is exposed to various stress conditions, or a "pathogen-inducible" i.e. activated when a plant is exposed to exposure to various pathogens.

Organ-specific/Tissue-specific promoter

An "organ-specific" or "tissue-specific promoter" is one that is capable of preferentially initiating transcription in certain organs or tissues, such as the leaves, roots, seed tissue etc. For example, a "root-specific promoter" is a promoter that is transcriptionally active predominantly in plant roots, substantially to the exclusion of any other parts of a plant, whilst still allowing for any leaky expression in these other plant parts. Promoters able to initiate tran- scription in certain cells only are referred to herein as "cell-specific".

Examples of root-specific promoters are listed in Table 2b below:

Table 2b: Examples of root-specific promoters

Gene Source Reference

RCc3 Plant Mol Biol. 1995 Jan;27(2):237-48

Arabidopsis PHT1 Koyama et al. J Biosci Bioeng. 2005 Jan;99(1 ):38-42.; Mudge et al. (2002, Plant J. 31 :341 )

Medicago phosphate Xiao et al., 2006, Plant Biol (Stuttg). 2006 Jul;8(4):439-49 transporter

Arabidopsis Pyk10 Nitz et al. (2001 ) Plant Sci 161 (2): 337-346

root-expressible genes Tingey et al., EMBO J. 6: 1 , 1987.

tobacco auxin-inducible Van der Zaal et al., Plant Mol. Biol. 16, 983, 1991 .

gene

β-tubulin Oppenheimer, et al., Gene 63: 87, 1988.

tobacco root-specific Conkling, et al., Plant Physiol. 93: 1203, 1990.

genes

B. napus G1 -3b gene United States Patent No. 5, 401 , 836

SbPRPI Suzuki et al., Plant Mol. Biol. 21 : 109-1 19, 1993.

LRX1 Baumberger et al. 2001 , Genes & Dev. 15:1 128

BTG-26 Brassica napus US 20050044585

LeAMTI (tomato) Lauter et al. (1996, PNAS 3:8139)

The LeNRTM (tomato) Lauter et al. (1996, PNAS 3:8139)

class 1 patatin gene (poLiu et al., Plant Mol. Biol. 17 (6): 1 139-1 154

tato)

KDC1 (Daucus carota) Downey et al. (2000, J. Biol. Chem. 275:39420)

TobRB7 gene W Song (1997) PhD Thesis, North Carolina State University,

Raleigh, NC USA

OsRAB5a (rice) Wang et al. 2002, Plant Sci. 163:273

ALF5 (Arabidopsis) Diener et al. (2001 , Plant Cell 13: 1625)

NRT2;1 Np (N. plumbag- Quesada et al. (1997, Plant Mol. Biol. 34:265) inifolia)

A "seed-specific promoter" is transcriptionally active predominantly in seed tissue, but not necessarily exclusively in seed tissue (in cases of leaky expression). The seed-specific promoter may be active during seed development and/or during germination. The seed specific promoter may be endosperm/aleurone/embryo specific. Examples of seed-specific promoters (endosperm/aleurone/embryo specific) are shown in Table 2c to Table 2f below. Further examples of seed-specific promoters are given in Qing Qu and Takaiwa (Plant Bio- technol. J. 2, 1 13-125, 2004), which disclosure is incorporated by reference herein as if fully set forth.

Table 2c: Examples of seed-specific promoters

Gene source Reference

seed-specific genes Simon et al., Plant Mol. Biol. 5: 191 , 1985;

Scofield et al., J. Biol. Chem. 262: 12202, 1987.;

Baszczynski et al., Plant Mol. Biol. 14: 633, 1990.

Brazil Nut albumin Pearson et al., Plant Mol. Biol. 18: 235-245, 1992. legumin Ellis et al., Plant Mol. Biol. 10: 203-214, 1988.

glutelin (rice) Takaiwa et al., Mol. Gen. Genet. 208: 15-22, 1986;

Takaiwa et al., FEBS Letts. 221 : 43-47, 1987.

zein Matzke et al Plant Mol Biol, 14(3):323-32 1990 napA Stalberg et al, Planta 199: 515-519, 1996.

wheat LMW and HMW glutenin-1 Mol Gen Genet 216:81 -90, 1989; NAR 17:461 -2, 1989 wheat SPA Albani et al, Plant Cell, 9: 171-184, 1997

wheat α, β, γ-gliadins EMBO J. 3:1409-15, 1984

barley Itr1 promoter Diaz et al. (1995) Mol Gen Genet 248(5):592-8 barley B1 , C, D, hordein Theor Appl Gen 98:1253-62, 1999; Plant J 4:343-55,

1993; Mol Gen Genet 250:750-60, 1996

barley DOF Mena et al, The Plant Journal, 1 16(1 ): 53-62, 1998 blz2 EP99106056.7

synthetic promoter Vicente-Carbajosa et al., Plant J. 13: 629-640, 1998. rice prolamin NRP33 Wu et al, Plant Cell Physiology 39(8) 885-889, 1998 rice a-globulin Glb-1 Wu et al, Plant Cell Physiology 39(8) 885-889, 1998 rice OSH1 Sato et al, Proc. Natl. Acad. Sci. USA, 93: 8117-8122,

1996

rice a-globulin REB/OHP-1 Nakase et al. Plant Mol. Biol. 33: 513-522, 1997 rice ADP-glucose pyrophos- Trans Res 6:157-68, 1997

phorylase

maize ESR gene family Plant J 12:235-46, 1997

sorghum a-kafirin DeRose et al., Plant Mol. Biol 32:1029-35, 1996

KNOX Postma-Haarsma et al, Plant Mol. Biol. 39:257-71 , 1999

rice oleosin Wu et al, J. Biochem. 123:386, 1998

sunflower oleosin Cummins et al., Plant Mol. Biol. 19: 873-876, 1992

PRO01 17, putative rice 40S ribo- WO 2004/070039

somal protein

PRO0136, rice alanine amiunpublished

notransferase

PRO0147, trypsin inhibitor ITR1 unpublished

(barley)

PRO0151 , rice WSI18 WO 2004/070039

PRO0175, rice RAB21 WO 2004/070039

PRO005 WO 2004/070039

PRO0095 WO 2004/070039

a-amylase (Amy32b) Lanahan et al, Plant Cell 4:203-211 , 1992; Skriver et al, Proc Natl Acad Sci USA 88:7266-7270, 1991 cathepsin β-like gene Cejudo et al, Plant Mol Biol 20:849-856, 1992

Barley Ltp2 Kalla et al., Plant J. 6:849-60, 1994

Chi26 Leah et al., Plant J. 4:579-89, 1994

Maize B-Peru Selinger et al., Genetics 149;1 125-38,1998

Table 2d: examples of endosperm-specific promoters

Gene source Reference

glutelin (rice) Takaiwa et al. (1986) Mol Gen Genet 208:15-22; Takaiwa et al.

(1987) FEBS Letts. 221 :43-47

zein Matzke et al., (1990) Plant Mol Biol 14(3): 323-32

wheat LMW and HMW Colot et al. (1989) Mol Gen Genet 216:81 -90, Anderson et al. glutenin-1 (1989) NAR 17:461 -2

wheat SPA Albani et al. (1997) Plant Cell 9:171 -184

wheat gliadins Rafalski et al. (1984) EMBO 3:1409-15

barley Itr1 promoter Diaz et al. (1995) Mol Gen Genet 248(5):592-8

barley B1 , C, D, hordein Cho et al. (1999) Theor Appl Genet 98:1253-62; Muller et al.

(1993) Plant J 4:343-55; Sorenson et al. (1996) Mol Gen Genet 250:750-60

barley DOF Mena et al, (1998) Plant J 1 16(1 ): 53-62

blz2 Onate et al. (1999) J Biol Chem 274(14):9175-82

synthetic promoter Vicente-Carbajosa et al. (1998) Plant J 13:629-640

rice prolamin NRP33 Wu et al, (1998) Plant Cell Physiol 39(8) 885-889

rice globulin Glb-1 Wu et al. (1998) Plant Cell Physiol 39(8) 885-889

rice globulin REB/OHP-1 Nakase et al. (1997) Plant Molec Biol 33: 513-522

rice ADP-glucose pyro- Russell et al. (1997) Trans Res 6:157-68

phosphorylase maize ESR gene family Opsahl-Ferstad et al. (1997) Plant J 12:235-46

sorghum kafirin DeRose et al. (1996) Plant Mol Biol 32:1029-35

Table 2e: Examples of embryo specific promoters:

Gene source Reference

rice OSH1 Sato et al, Proc. Natl. Acad. Sci. USA, 93: 81 17-8122, 1996

KNOX Postma-Haarsma et al, Plant Mol. Biol. 39:257-71 , 1999

PRO0151 WO 2004/070039

PRO0175 WO 2004/070039

PRO005 WO 2004/070039

PRO0095 WO 2004/070039

Table 2f: Examples of aleurone-specific promoters:

Gene source Reference

a-amylase (Amy32b) Lanahan et al, Plant Cell 4:203-21 1 , 1992; Skriver et al, Proc

Natl Acad Sci USA 88:7266-7270, 1991

cathepsin β-like gene Cejudo et al, Plant Mol Biol 20:849-856, 1992

Barley Ltp2 Kalla et al., Plant J. 6:849-60, 1994

Chi26 Leah et al., Plant J. 4:579-89, 1994

Maize B-Peru Selinger et al., Genetics 149; 1 125-38,1998

A "green tissue-specific promoter" as defined herein is a promoter that is transcriptionally active predominantly in green tissue, substantially to the exclusion of any other parts of a plant, whilst still allowing for any leaky expression in these other plant parts. Examples of green tissue-specific promoters which may be used to perform the methods of the invention are shown in Table 2g below.

Table 2g: Examples of green tissue-specific promoters

Another example of a tissue-specific promoter is a meristem-specific promoter, which is transcriptionally active predominantly in meristematic tissue, substantially to the exclusion of any other parts of a plant, whilst still allowing for any leaky expression in these other plant parts. Examples of green meristem-specific promoters which may be used to perform the methods of the invention are shown in Table 2h below.

Table 2h: Examples of meristem-specific promoters

Terminator

The term "terminator" encompasses a control sequence which is a DNA sequence at the end of a transcriptional unit which signals 3' processing and polyadenylation of a primary transcript and termination of transcription. The terminator can be derived from the natural gene, from a variety of other plant genes, or from T-DNA. The terminator to be added may be derived from, for example, the nopaline synthase or octopine synthase genes, or alterna- tively from another plant gene, or less preferably from any other eukaryotic gene.

Selectable marker (gene)/Reporter gene

"Selectable marker", "selectable marker gene" or "reporter gene" includes any gene that confers a phenotype on a cell in which it is expressed to facilitate the identification and/or selection of cells that are transfected or transformed with a nucleic acid construct of the invention. These marker genes enable the identification of a successful transfer of the nucleic acid molecules via a series of different principles. Suitable markers may be selected from markers that confer antibiotic or herbicide resistance, that introduce a new metabolic trait or that allow visual selection. Examples of selectable marker genes include genes conferring resistance to antibiotics (such as nptll that phosphorylates neomycin and kanamycin, or hpt, phosphorylating hygromycin, or genes conferring resistance to, for example, bleomycin, streptomycin, tetracyclin, chloramphenicol, ampicillin, gentamycin, geneticin (G418), spec- tinomycin or blasticidin), to herbicides (for example bar which provides resistance to Basta^®; aroA or gox providing resistance against glyphosate, or the genes conferring resistance to, for example, imidazolinone, phosphinothricin or sulfonylurea), or genes that provide a metabolic trait (such as manA that allows plants to use mannose as sole carbon source or xylose isomerase for the utilisation of xylose, or antinutritive markers such as the resistance to 2-deoxyglucose). Expression of visual marker genes results in the formation of colour (for example β-glucuronidase, GUS or β-galactosidase with its coloured substrates, for example X-Gal), luminescence (such as the luciferin/luceferase system) or fluorescence (Green Fluorescent Protein, GFP, and derivatives thereof). This list represents only a small number of possible markers. The skilled worker is familiar with such markers. Different markers are preferred, depending on the organism and the selection method.

It is known that upon stable or transient integration of nucleic acids into plant cells, only a minority of the cells takes up the foreign DNA and, if desired, integrates it into its genome, depending on the expression vector used and the transfection technique used. To identify and select these integrants, a gene coding for a selectable marker (such as the ones described above) is usually introduced into the host cells together with the gene of interest. These markers can for example be used in mutants in which these genes are not functional by, for example, deletion by conventional methods. Furthermore, nucleic acid molecules encoding a selectable marker can be introduced into a host cell on the same vector that comprises the sequence encoding the polypeptides of the invention or used in the methods of the invention, or else in a separate vector. Cells which have been stably transfected with the introduced nucleic acid can be identified for example by selection (for example, cells which have integrated the selectable marker survive whereas the other cells die). Since the marker genes, particularly genes for resistance to antibiotics and herbicides, are no longer required or are undesired in the transgenic host cell once the nucleic acids have been introduced successfully, the process according to the invention for introducing the nucleic acids advantageously employs techniques which enable the removal or excision of these marker genes. One such a method is what is known as co-transformation. The co- transformation method employs two vectors simultaneously for the transformation, one vector bearing the nucleic acid according to the invention and a second bearing the marker gene(s). A large proportion of transformants receives or, in the case of plants, comprises (up to 40% or more of the transformants), both vectors. In case of transformation with Agro- bacteria, the transformants usually receive only a part of the vector, i.e. the sequence flanked by the T-DNA, which usually represents the expression cassette. The marker genes can subsequently be removed from the transformed plant by performing crosses. In another method, marker genes integrated into a transposon are used for the transformation together with desired nucleic acid (known as the Ac/Ds technology). The transformants can be crossed with a transposase source or the transformants are transformed with a nucleic acid construct conferring expression of a transposase, transiently or stable. In some cases (ap- prox. 10%), the transposon jumps out of the genome of the host cell once transformation has taken place successfully and is lost. In a further number of cases, the transposon jumps to a different location. In these cases the marker gene must be eliminated by performing crosses. In microbiology, techniques were developed which make possible, or facilitate, the detection of such events. A further advantageous method relies on what is known as recombination systems; whose advantage is that elimination by crossing can be dispensed with. The best-known system of this type is what is known as the Cre/lox system. Cre1 is a recombinase that removes the sequences located between the loxP sequences. If the marker gene is integrated between the loxP sequences, it is removed once transformation has taken place successfully, by expression of the recombinase. Further recombination systems are the HIN/HIX, FLP/FRT and REP/STB system (Tribble et al., J. Biol. Chem., 275, 2000: 22255-22267; Velmurugan et al., J. Cell Biol., 149, 2000: 553-566). A site-specific integration into the plant genome of the nucleic acid sequences according to the invention is possible. Naturally, these methods can also be applied to microorganisms such as yeast, fungi or bacteria. Transgenic/Transgene/Recombinant

For the purposes of the invention, "transgenic", "transgene" or "recombinant" means with regard to, for example, a nucleic acid sequence, an expression cassette, genetic construct or a vector comprising the nucleic acid sequence or an organism transformed with the nucleic acid sequences, expression cassettes or vectors according to the invention, all those constructions brought about by recombinant methods in which either

(a) the nucleic acid sequences encoding proteins useful in the methods of the invention, or

(b) genetic control sequence(s) which is operably linked with the nucleic acid sequence according to the invention, for example a promoter, or

(c) a) and b)

are not located in their natural genetic environment or have been modified by recombinant methods, it being possible for the modification to take the form of, for example, a substitution, addition, deletion, inversion or insertion of one or more nucleotide residues. The natural genetic environment is understood as meaning the natural genomic or chromosomal locus in the original plant or the presence in a genomic library. In the case of a genomic library, the natural genetic environment of the nucleic acid sequence is preferably retained, at least in part. The environment flanks the nucleic acid sequence at least on one side and has a sequence length of at least 50 bp, preferably at least 500 bp, especially preferably at least 1000 bp, most preferably at least 5000 bp. A naturally occurring expression cassette - for example the naturally occurring combination of the natural promoter of the nucleic acid sequences with the corresponding nucleic acid sequence encoding a polypeptide useful in the methods of the present invention, as defined above - becomes a transgenic expression cassette when this expression cassette is modified by man by non-natural, synthetic ("artificial") methods such as, for example, mutagenic treatment. Suitable methods are described, for example, in US 5,565,350, US200405323 or WO 00/15815. Furthermore, a naturally occurring expression cassette - for example the naturally occurring combination of the natural promoter of the nucleic acid sequences with the corresponding nucleic acid sequence encoding a protein useful in the methods of the present invention, as defined above - becomes a recombinant expression cassette when this expression cassette is not integrated in the natural genetic environment but in a different genetic environment as a result of an isolation of said expression cassette from its natural genetic environment and re-insertion at a different genetic environment. It shall further be noted that in the context of the present invention, the term "isolated nucleic acid" or "isolated polypeptide" may in some instances be considered as a synonym for a "recombinant nucleic acid" or a "recombinant polypeptide", respectively and refers to a nu- cleic acid or polypeptide that is not located in its natural genetic environment or cellular environment, respectively, and/or that has been modified by recombinant methods. An isolated nucleic acid sequence or isolated nucleic acid molecule is one that is not in its native surrounding or its native nucleic acid neighbourhood, yet it is physically and functionally connected to other nucleic acid sequences or nucleic acid molecules and is found as part of a nucleic acid construct, vector sequence or chromosome.

A transgenic plant for the purposes of the invention is thus understood as meaning, as above, that the nucleic acids used in the method of the invention are not present in, or originating from, the genome of said plant, or are present in the genome of said plant but not at their natural locus in the genome of said plant, it being possible for the nucleic acids to be expressed homologously or heterologously. However, as mentioned, transgenic also means that, while the nucleic acids according to the invention or used in the inventive method are at their natural position in the genome of a plant, the sequence has been modified with regard to the natural sequence, and/or that the regulatory sequences of the natural sequenc- es have been modified. Transgenic is preferably understood as meaning the expression of the nucleic acids according to the invention at an unnatural locus in the genome, i.e. homologous or, preferably, heterologous expression of the nucleic acids takes place. Preferred transgenic plants are mentioned herein. As used herein, the term "transgenic" relating to an organisms e.g. transgenic plant refers to an organism, e.g., a plant, plant cell, callus, plant tissue, or plant part that exogenously contains the nucleic acid, construct, vector or expression cassette described herein or a part thereof which is preferably introduced by processes that are not essentially biological, preferably by Agrobacteria-mediated transformation or particle bombardment. A transgenic plant for the purposes of the invention is thus understood as meaning, as above, that the nucleic acids described herein are not present in, or not originating from the genome of said plant, or are present in the genome of said plant but not at their natural genetic environment in the genome of said plant, it being possible for the nucleic acids to be expressed homologously or heterologously

Modulation

The term "modulation" means in relation to expression or gene expression, a process in which the expression level is changed by said gene expression in comparison to the control plant, the expression level may be increased or decreased. The original, unmodulated ex- pression may be of any kind of expression of a structural RNA (rRNA, tRNA) or mRNA with subsequent translation. For the purposes of this invention, the original unmodulated expression may also be absence of any expression. The term "modulating the activity" or the term "modulating expression" with respect to the proteins or nucleic acids used in the methods, constructs, expression cassettes, vectors, plants, seeds, host cells and uses of the invention shall mean any change of the expression of the inventive nucleic acid sequences or encoded proteins which leads to increased or decreased yield-related traits in the plants . The expression can increase from zero (absence of, or immeasurable expression) to a certain amount, or can decrease from a certain amount to immeasurable small amounts or zero.

Expression

The term "expression" or "gene expression" means the transcription of a specific gene or specific genes or specific genetic construct. The term "expression" or "gene expression" in particular means the transcription of a gene or genes or genetic construct into structural RNA (rRNA, tRNA) or mRNA with or without subsequent translation of the latter into a protein. The process includes transcription of DNA and processing of the resulting mRNA product. The term "expression" or "gene expression" can also include the translation of the mRNA and therewith the synthesis of the encoded protein, i.e., protein expression.

Increased expression/overexpression

The term "increased expression", "enhanced expression" or "overexpression" as used here- in means any form of expression that is additional to the original wild-type expression level. For the purposes of this invention, the original wild-type expression level might also be zero, i.e. absence of expression or immeasurable expression. Reference herein to "increased expression", "enhanced expression" or "overexpression" is taken to mean an increase in gene expression and/or, as far as referring to polypeptides, increased polypeptide levels and/or increased polypeptide activity, relative to control plants. The increase in expression, polypeptide levels or polypeptide activity is in increasing order of preference at least 10%, 20%, 30%, 40% or 50%, 60%, 70%, 80%, 85%, 90%, or 100% or even more compared to that of control plants. The increase in expression may be in increasing order of preference at least 100%, 200%, 300%, 400%, 500%, 600%, 700%, 800%, 900%, 1000%, 2000%, 3000%, 4000% or 5000% or even more compared to that of control plants. In cases when the control plants have only very little expression, polypeptide levels or polypeptide activity of the sequence in question and/or the recombinant gene is under the control of strong regulatory element(s) the increase in expression, polypeptide levels or polypeptide activity may be at least 100 times, 200 times, 300 times, 400 times, 500 times, 600 times, 700 times, 800 times, 900 times, 1000 times, 2000 times, 3000 times, 5000 times, 10 000 times, 20 000 times, 50 000 times, 100 000 times or even more compared to that of control plants. Methods for increasing expression of genes or gene products are well documented in the art and include, for example, overexpression driven by appropriate promoters, the use of transcription enhancers or translation enhancers. Isolated nucleic acids which serve as promoter or enhancer elements may be introduced in an appropriate position (typically upstream) of a non-heterologous form of a polynucleotide so as to upregulate expression of a nucleic acid encoding the polypeptide of interest. For example, endogenous promoters may be altered in vivo by mutation, deletion, and/or substitution (see, Kmiec, US 5,565,350; Zarling et al., W09322443), or isolated promoters may be introduced into a plant cell in the proper orientation and distance from a gene of the present invention so as to control the expression of the gene.

If polypeptide expression is desired, it is generally desirable to include a polyadenylation region at the 3'-end of a polynucleotide coding region. The polyadenylation region can be derived from the natural gene, from a variety of other plant genes, or from T-DNA. The 3' end sequence to be added may be derived from, for example, the nopaline synthase or oc- topine synthase genes, or alternatively from another plant gene, or less preferably from any other eukaryotic gene.

An intron sequence may also be added to the 5' untranslated region (UTR) or the coding sequence of the partial coding sequence to increase the amount of the mature message that accumulates in the cytosol. Inclusion of a spliceable intron in the transcription unit in both plant and animal expression constructs has been shown to increase gene expression at both the mRNA and protein levels up to 1000-fold (Buchman and Berg (1988) Mol. Cell biol. 8: 4395-4405; Callis et al. (1987) Genes Dev 1 :1 183-1200). Such intron enhancement of gene expression is typically greatest when placed near the 5' end of the transcription unit. Use of the maize introns Adh1 -S intron 1 , 2, and 6, the Bronze-1 intron are known in the art. For general information see: The Maize Handbook, Chapter 116, Freeling and Walbot, Eds., Springer, N.Y. (1994).

To obtain increased expression or overexpression of a polypeptide most commonly the nucleic acid encoding this polypeptide is overexpressed in sense orientation with a polyad- enylation signal. Introns or other enhancing elements may be used in addition to a promoter suitable for driving expression with the intended expression pattern. In contrast to this, overexpression of the same nucleic acid sequence as antisense construct will not result in increased expression of the protein, but decreased expression of the protein. Decreased expression

Reference herein to "decreased expression" or "reduction or substantial elimination" of expression is taken to mean a decrease in endogenous gene expression and/or polypeptide levels and/or polypeptide activity relative to control plants. The reduction or substantial elimination is in increasing order of preference at least 10%, 20%, 30%, 40% or 50%, 60%, 70%, 80%, 85%, 90%, or 95%, 96%, 97%, 98%, 99% or more compared to that of control plants.

For the reduction or substantial elimination of expression an endogenous gene in a plant, a sufficient length of substantially contiguous nucleotides of a nucleic acid sequence is re- quired. In order to perform gene silencing, this may be as little as 20, 19, 18, 17, 16, 15, 14, 13, 12, 11 , 10 or fewer nucleotides, alternatively this may be as much as the entire gene (including the 5' and/or 3' UTR, either in part or in whole). The stretch of substantially con- tiguous nucleotides may be derived from the nucleic acid encoding the protein of interest (target gene), or from any nucleic acid capable of encoding an orthologue, paralogue or homologue of the protein of interest. Preferably, the stretch of substantially contiguous nucleotides is capable of forming hydrogen bonds with the target gene (either sense or anti- sense strand), more preferably, the stretch of substantially contiguous nucleotides has, in increasing order of preference, 50%, 60%, 70%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, 99%, 100% sequence identity to the target gene (either sense or antisense strand). A nucleic acid sequence encoding a (functional) polypeptide is not a requirement for the various methods discussed herein for the reduction or substantial elimination of expression of an endogenous gene.

This reduction or substantial elimination of expression may be achieved using routine tools and techniques. A preferred method for the reduction or substantial elimination of endogenous gene expression is by introducing, preferably by recombinant methods, and express- ing in a plant a genetic construct into which the nucleic acid (in this case a stretch of substantially contiguous nucleotides derived from the gene of interest, or from any nucleic acid capable of encoding an orthologue, paralogue or homologue of any one of the protein of interest) is cloned as an inverted repeat (in part or completely), separated by a spacer (non- coding DNA).

In such a preferred method, expression of the endogenous gene is reduced or substantially eliminated through RNA-mediated silencing using an inverted repeat of a nucleic acid or a part thereof (in this case a stretch of substantially contiguous nucleotides derived from the gene of interest, or from any nucleic acid capable of encoding an orthologue, paralogue or homologue of the protein of interest), preferably capable of forming a hairpin structure. The inverted repeat is cloned in an expression vector comprising control sequences. A non- coding DNA nucleic acid sequence (a spacer, for example a matrix attachment region fragment (MAR), an intron, a polylinker, etc.) is located between the two inverted nucleic acids forming the inverted repeat. After transcription of the inverted repeat, a chimeric RNA with a self-complementary structure is formed (partial or complete). This double-stranded RNA structure is referred to as the hairpin RNA (hpRNA). The hpRNA is processed by the plant into siRNAs that are incorporated into an RNA-induced silencing complex (RISC). The RISC further cleaves the mRNA transcripts, thereby substantially reducing the number of mRNA transcripts to be translated into polypeptides. For further general details see for ex- ample, Grierson et al. (1998) WO 98/53083; Waterhouse et al. (1999) WO 99/53050).

Performance of the methods of the invention does not rely on introducing and expressing in a plant a genetic construct into which the nucleic acid is cloned as an inverted repeat, but any one or more of several well-known "gene silencing" methods may be used to achieve the same effects. One such method for the reduction of endogenous gene expression is RNA-mediated silencing of gene expression (downregulation). Silencing in this case is triggered in a plant by a double stranded RNA sequence (dsRNA) that is substantially similar to the target endogenous gene. This dsRNA is further processed by the plant into about 20 to about 26 nucleo- tides called short interfering RNAs (siRNAs). The siRNAs are incorporated into an RNA- induced silencing complex (RISC) that cleaves the mRNA transcript of the endogenous target gene, thereby substantially reducing the number of mRNA transcripts to be translated into a polypeptide. Preferably, the double stranded RNA sequence corresponds to a target gene.

Another example of an RNA silencing method involves the introduction of nucleic acid sequences or parts thereof (in this case a stretch of substantially contiguous nucleotides derived from the gene of interest, or from any nucleic acid capable of encoding an orthologue, paralogue or homologue of the protein of interest) in a sense orientation into a plant. "Sense orientation" refers to a DNA sequence that is homologous to an mRNA transcript thereof. Introduced into a plant would therefore be at least one copy of the nucleic acid sequence. The additional nucleic acid sequence will reduce expression of the endogenous gene, giving rise to a phenomenon known as co-suppression. The reduction of gene expression will be more pronounced if several additional copies of a nucleic acid sequence are introduced into the plant, as there is a positive correlation between high transcript levels and the triggering of co-suppression.

Another example of an RNA silencing method involves the use of antisense nucleic acid sequences. An "antisense" nucleic acid sequence comprises a nucleotide sequence that is complementary to a "sense" nucleic acid sequence encoding a protein, i.e. complementary to the coding strand of a double-stranded cDNA molecule or complementary to an mRNA transcript sequence. The antisense nucleic acid sequence is preferably complementary to the endogenous gene to be silenced. The complementarity may be located in the "coding region" and/or in the "non-coding region" of a gene. The term "coding region" refers to a region of the nucleotide sequence comprising codons that are translated into amino acid residues. The term "non-coding region" refers to 5' and 3' sequences that flank the coding region that are transcribed but not translated into amino acids (also referred to as 5' and 3' untranslated regions). Antisense nucleic acid sequences can be designed according to the rules of Watson and Crick base pairing. The antisense nucleic acid sequence may be complementary to the entire nucleic acid sequence (in this case a stretch of substantially contiguous nucleotides derived from the gene of interest, or from any nucleic acid capable of encoding an orthologue, paralogue or homologue of the protein of interest), but may also be an oligonu- cleotide that is antisense to only a part of the nucleic acid sequence (including the mRNA 5' and 3' UTR). For example, the antisense oligonucleotide sequence may be complementary to the region surrounding the translation start site of an mRNA transcript encoding a poly- peptide. The length of a suitable antisense oligonucleotide sequence is known in the art and may start from about 50, 45, 40, 35, 30, 25, 20, 15 or 10 nucleotides in length or less. An antisense nucleic acid sequence according to the invention may be constructed using chemical synthesis and enzymatic ligation reactions using methods known in the art. For example, an antisense nucleic acid sequence (e.g., an antisense oligonucleotide sequence) may be chemically synthesized using naturally occurring nucleotides or variously modified nucleotides designed to increase the biological stability of the molecules or to increase the physical stability of the duplex formed between the antisense and sense nucleic acid sequences, e.g., phosphorothioate derivatives and acridine substituted nucleotides may be used. Examples of modified nucleotides that may be used to generate the antisense nucleic acid sequences are well known in the art. Known nucleotide modifications include methyla- tion, cyclization and 'caps' and substitution of one or more of the naturally occurring nucleotides with an analogue such as inosine. Other modifications of nucleotides are well known in the art.

The antisense nucleic acid sequence can be produced biologically using an expression vector into which a nucleic acid sequence has been subcloned in an antisense orientation (i.e., RNA transcribed from the inserted nucleic acid will be of an antisense orientation to a target nucleic acid of interest). Preferably, production of antisense nucleic acid sequences in plants occurs by means of a stably integrated nucleic acid construct comprising a promoter, an operably linked antisense oligonucleotide, and a terminator.

The nucleic acid molecules used for silencing in the methods of the invention (whether introduced into a plant or generated in situ) hybridize with or bind to mRNA transcripts and/or genomic DNA encoding a polypeptide to thereby inhibit expression of the protein, e.g., by inhibiting transcription and/or translation. The hybridization can be by conventional nucleotide complementarity to form a stable duplex, or, for example, in the case of an antisense nucleic acid sequence which binds to DNA duplexes, through specific interactions in the major groove of the double helix. Antisense nucleic acid sequences may be introduced into a plant by transformation or direct injection at a specific tissue site. Alternatively, antisense nucleic acid sequences can be modified to target selected cells and then administered sys- temically. For example, for systemic administration, antisense nucleic acid sequences can be modified such that they specifically bind to receptors or antigens expressed on a selected cell surface, e.g., by linking the antisense nucleic acid sequence to peptides or antibod- ies which bind to cell surface receptors or antigens. The antisense nucleic acid sequences can also be delivered to cells using the vectors described herein.

According to a further aspect, the antisense nucleic acid sequence is an a-anomeric nucleic acid sequence. An a-anomeric nucleic acid sequence forms specific double-stranded hy- brids with complementary RNA in which, contrary to the usual b-units, the strands run parallel to each other (Gaultier et al. (1987) Nucl Ac Res 15: 6625-6641 ). The antisense nucleic acid sequence may also comprise a 2'-o-methylribonucleotide (Inoue et al. (1987) Nucl Ac Res 15, 6131 -6148) or a chimeric RNA-DNA analogue (Inoue et al. (1987) FEBS Lett. 215, 327-330).

The reduction or substantial elimination of endogenous gene expression may also be per- formed using ribozymes. Ribozymes are catalytic RNA molecules with ribonuclease activity that are capable of cleaving a single-stranded nucleic acid sequence, such as an mRNA, to which they have a complementary region. Thus, ribozymes (e.g., hammerhead ribozymes (described in Haselhoff and Gerlach (1988) Nature 334, 585-591) can be used to catalyti- cally cleave mRNA transcripts encoding a polypeptide, thereby substantially reducing the number of mRNA transcripts to be translated into a polypeptide. A ribozyme having specificity for a nucleic acid sequence can be designed (see for example: Cech et al. U.S. Patent No. 4,987,071 ; and Cech et al. U.S. Patent No. 5,116,742). Alternatively, mRNA transcripts corresponding to a nucleic acid sequence can be used to select a catalytic RNA having a specific ribonuclease activity from a pool of RNA molecules (Bartel and Szostak (1993) Sci- ence 261 , 141 1 -1418). The use of ribozymes for gene silencing in plants is known in the art (e.g., Atkins et al. (1994) WO 94/00012; Lenne et al. (1995) WO 95/03404; Lutziger et al. (2000) WO 00/00619; Prinsen et al. (1997) WO 97/13865 and Scott et al. (1997) WO 97/381 16). Gene silencing may also be achieved by insertion mutagenesis (for example, T-DNA insertion or transposon insertion) or by strategies as described by, among others, Angell and Baulcombe ((1999) Plant J 20(3): 357-62), (Amplicon VIGS WO 98/36083), or Baulcombe (WO 99/15682). Gene silencing may also occur if there is a mutation on an endogenous gene and/or a mutation on an isolated gene/nucleic acid subsequently introduced into a plant. The reduction or substantial elimination may be caused by a non-functional polypeptide. For example, the polypeptide may bind to various interacting proteins; one or more mutation(s) and/or truncation^) may therefore provide for a polypeptide that is still able to bind interacting proteins (such as receptor proteins) but that cannot exhibit its normal function (such as signalling ligand).

A further approach to gene silencing is by targeting nucleic acid sequences complementary to the regulatory region of the gene (e.g., the promoter and/or enhancers) to form triple heli- cal structures that prevent transcription of the gene in target cells. See Helene, C, Anticancer Drug Res. 6, 569-84, 1991 ; Helene et al., Ann. N.Y. Acad. Sci. 660, 27-36 1992; and Maher, L.J. Bioassays 14, 807-15, 1992.

Other methods, such as the use of antibodies directed to an endogenous polypeptide for inhibiting its function in planta, or interference in the signalling pathway in which a polypeptide is involved, will be well known to the skilled man. In particular, it can be envisaged that manmade molecules may be useful for inhibiting the biological function of a target polypeptide, or for interfering with the signalling pathway in which the target polypeptide is involved.

Alternatively, a screening program may be set up to identify in a plant population natural variants of a gene, which variants encode polypeptides with reduced activity. Such natural variants may also be used for example, to perform homologous recombination.

Artificial and/or natural microRNAs (miRNAs) may be used to knock out gene expression and/or mRNA translation. Endogenous miRNAs are single stranded small RNAs of typically 19-24 nucleotides long. They function primarily to regulate gene expression and/ or mRNA translation. Most plant microRNAs (miRNAs) have perfect or near-perfect complementarity with their target sequences. However, there are natural targets with up to five mismatches. They are processed from longer non-coding RNAs with characteristic fold-back structures by double-strand specific RNases of the Dicer family. Upon processing, they are incorpo- rated in the RNA-induced silencing complex (RISC) by binding to its main component, an Argonaute protein. MiRNAs serve as the specificity components of RISC, since they base- pair to target nucleic acids, mostly mRNAs, in the cytoplasm. Subsequent regulatory events include target mRNA cleavage and destruction and/or translational inhibition. Effects of miRNA overexpression are thus often reflected in decreased mRNA levels of target genes.

Artificial microRNAs (amiRNAs), which are typically 21 nucleotides in length, can be genetically engineered specifically to negatively regulate gene expression of single or multiple genes of interest. Determinants of plant microRNA target selection are well known in the art. Empirical parameters for target recognition have been defined and can be used to aid in the design of specific amiRNAs, (Schwab et al., Dev. Cell 8, 517-527, 2005). Convenient tools for design and generation of amiRNAs and their precursors are also available to the public (Schwab et al., Plant Cell 18, 1 121-1 133, 2006).

For optimal performance, the gene silencing techniques used for reducing expression in a plant of an endogenous gene requires the use of nucleic acid sequences from monocotyle- donous plants for transformation of monocotyledonous plants, and from dicotyledonous plants for transformation of dicotyledonous plants. Preferably, a nucleic acid sequence from any given plant species is introduced into that same species. For example, a nucleic acid sequence from rice is transformed into a rice plant. However, it is not an absolute require- ment that the nucleic acid sequence to be introduced originates from the same plant species as the plant in which it will be introduced. It is sufficient that there is substantial homology between the endogenous target gene and the nucleic acid to be introduced.

Described above are examples of various methods for the reduction or substantial elimina- tion of expression in a plant of an endogenous gene. A person skilled in the art would readily be able to adapt the aforementioned methods for silencing so as to achieve reduction of expression of an endogenous gene in a whole plant or in parts thereof through the use of an appropriate promoter, for example. Transformation

The term "introduction" or "transformation" as referred to herein encompasses the transfer of an exogenous polynucleotide into a host cell, irrespective of the method used for transfer. Plant tissue capable of subsequent clonal propagation, whether by organogenesis or em- bryogenesis, may be transformed with a genetic construct of the present invention and a whole plant regenerated there from. The particular tissue chosen will vary depending on the clonal propagation systems available for, and best suited to, the particular species being transformed. Exemplary tissue targets include leaf disks, pollen, embryos, cotyledons, hy- pocotyls, megagametophytes, callus tissue, existing meristematic tissue (e.g., apical meri- stem, axillary buds, and root meristems), and induced meristem tissue (e.g., cotyledon me- ristem and hypocotyl meristem). The polynucleotide may be transiently or stably introduced into a host cell and may be maintained non-integrated, for example, as a plasmid. Alterna- tively, it may be integrated into the host genome. The resulting transformed plant cell may then be used to regenerate a transformed plant in a manner known to persons skilled in the art. Alternatively, a plant cell that cannot be regenerated into a plant may be chosen as host cell, i.e. the resulting transformed plant cell does not have the capacity to regenerate into a (whole) plant.

The transfer of foreign genes into the genome of a plant is called transformation. Transformation of plant species is now a fairly routine technique. Advantageously, any of several transformation methods may be used to introduce the gene of interest into a suitable ancestor cell. The methods described for the transformation and regeneration of plants from plant tissues or plant cells may be utilized for transient or for stable transformation. Transformation methods include the use of liposomes, electroporation, chemicals that increase free DNA uptake, injection of the DNA directly into the plant, particle gun bombardment, transformation using viruses or pollen and microprojection. Methods may be selected from the calcium/polyethylene glycol method for protoplasts (Krens, F.A. et al., (1982) Nature 296, 72-74; Negrutiu I et al. (1987) Plant Mol Biol 8: 363-373); electroporation of protoplasts (Shillito R.D. et al. (1985) Bio/Technol 3, 1099-1 102); microinjection into plant material (Crossway A et al., (1986) Mol. Gen Genet 202: 179-185); DNA or RNA-coated particle bombardment (Klein TM et al., (1987) Nature 327: 70) infection with (non-integrative) viruses and the like. Transgenic plants, including transgenic crop plants, are preferably produced via Agrobacterium-med\a .ed transformation. An advantageous transformation method is the transformation in planta. To this end, it is possible, for example, to allow the agrobacteria to act on plant seeds or to inoculate the plant meristem with agrobacteria. It has proved particularly expedient in accordance with the invention to allow a suspension of transformed agrobacteria to act on the intact plant or at least on the flower primordia. The plant is sub- sequently grown on until the seeds of the treated plant are obtained (Clough and Bent, Plant J. (1998) 16, 735-743). Methods for Agrobacterium-mediated transformation of rice include well known methods for rice transformation, such as those described in any of the following: European patent application EP 1 198985 A1 , Aldemita and Hodges (Planta 199: 612-617, 1996); Chan et al. (Plant Mol Biol 22 (3): 491-506, 1993), Hiei et al. (Plant J 6 (2): 271 -282, 1994), which disclosures are incorporated by reference herein as if fully set forth. In the case of corn transformation, the preferred method is as described in either Ishida et al. (Nat. Biotechnol 14(6): 745-50, 1996) or Frame et al. (Plant Physiol 129(1 ): 13-22, 2002), which disclosures are incorporated by reference herein as if fully set forth. Said methods are further described by way of example in B. Jenes et al., Techniques for Gene Transfer, in: Transgenic Plants, Vol. 1 , Engineering and Utilization, eds. S.D. Kung and R. Wu, Academic Press (1993) 128-143 and in Potrykus Annu. Rev. Plant Physiol. Plant Molec. Biol. 42 (1991 ) 205-225). The nucleic acids or the construct to be expressed is preferably cloned into a vector, which is suitable for transforming Agrobacterium tumefaciens, for example pBin19 (Bevan et al., Nucl. Acids Res. 12 (1984) 8711 ). Agrobacteria transformed by such a vector can then be used in known manner for the transformation of plants, such as plants used as a model, like Arabidopsis (Arabidopsis thaliana is within the scope of the present invention not considered as a crop plant), or crop plants such as, by way of example, tobacco plants, for example by immersing bruised leaves or chopped leaves in an agrobacterial solution and then culturing them in suitable media. The transformation of plants by means of Agrobacterium tumefaciens is described, for example, by Hofgen and Willmitzer in Nucl. Acid Res. (1988) 16, 9877 or is known inter alia from F.F. White, Vectors for Gene Transfer in Higher Plants; in Transgenic Plants, Vol. 1 , Engineering and Utilization, eds. S.D. Kung and R. Wu, Academic Press, 1993, pp. 15-38.

In addition to the transformation of somatic cells, which then have to be regenerated into intact plants, it is also possible to transform the cells of plant meristems and in particular those cells which develop into gametes. In this case, the transformed gametes follow the natural plant development, giving rise to transgenic plants. Thus, for example, seeds of Arabidopsis are treated with agrobacteria and seeds are obtained from the developing plants of which a certain proportion is transformed and thus transgenic (Feldman, KA and Marks MD (1987). Mol Gen Genet 208:1 -9; Feldmann K (1992). In: C Koncz, N-H Chua and J Shell, eds, Methods in Arabidopsis Research. Word Scientific, Singapore, pp. 274-289]. Alternative methods are based on the repeated removal of the inflorescences and incubation of the excision site in the center of the rosette with transformed agrobacteria, whereby transformed seeds can likewise be obtained at a later point in time (Chang (1994). Plant J. 5: 551 -558; Katavic (1994). Mol Gen Genet, 245: 363-370). However, an especially effec- tive method is the vacuum infiltration method with its modifications such as the "floral dip" method. In the case of vacuum infiltration of Arabidopsis, intact plants under reduced pressure are treated with an agrobacterial suspension (Bechthold, N (1993). C R Acad Sci Paris Life Sci, 316: 1194-1199), while in the case of the "floral dip" method the developing floral tissue is incubated briefly with a surfactant-treated agrobacterial suspension (Clough, SJ and Bent AF (1998) The Plant J. 16, 735-743]. A certain proportion of transgenic seeds are harvested in both cases, and these seeds can be distinguished from non-transgenic seeds by growing under the above-described selective conditions. In addition the stable transfer- mation of plastids is of advantages because plastids are inherited maternally is most crops reducing or eliminating the risk of transgene flow through pollen. The transformation of the chloroplast genome is generally achieved by a process which has been schematically displayed in Klaus et al., 2004 [Nature Biotechnology 22 (2), 225-229]. Briefly the sequences to be transformed are cloned together with a selectable marker gene between flanking sequences homologous to the chloroplast genome. These homologous flanking sequences direct site specific integration into the plastome. Plastidal transformation has been described for many different plant species and an overview is given in Bock (2001) Transgenic plastids in basic research and plant biotechnology. J Mol Biol. 2001 Sep 21 ; 312 (3):425-38 or Maliga, P (2003) Progress towards commercialization of plastid transformation technology. Trends Biotechnol. 21 , 20-28. Further biotechnological progress has recently been reported in form of marker free plastid transformants, which can be produced by a transient co-integrated maker gene (Klaus et al., 2004, Nature Biotechnology 22(2), 225-229).

The genetically modified plant cells can be regenerated via all methods with which the skilled worker is familiar. Suitable methods can be found in the abovementioned publications by S.D. Kung and R. Wu, Potrykus or Hofgen and Willmitzer. Alternatively, the genetically modified plant cells are non-regenerable into a whole plant.

Generally after transformation, plant cells or cell groupings are selected for the presence of one or more markers which are encoded by plant-expressible genes co-transferred with the gene of interest, following which the transformed material is regenerated into a whole plant. To select transformed plants, the plant material obtained in the transformation is, as a rule, subjected to selective conditions so that transformed plants can be distinguished from un- transformed plants. For example, the seeds obtained in the above-described manner can be planted and, after an initial growing period, subjected to a suitable selection by spraying. A further possibility consists in growing the seeds, if appropriate after sterilization, on agar plates using a suitable selection agent so that only the transformed seeds can grow into plants. Alternatively, the transformed plants are screened for the presence of a selectable marker such as the ones described herein.

Following DNA transfer and regeneration, putatively transformed plants may also be evaluated, for instance using Southern analysis, for the presence of the gene of interest, copy number and/or genomic organisation. Alternatively or additionally, expression levels of the newly introduced DNA may be monitored using Northern and/or Western analysis, both techniques being well known to persons having ordinary skill in the art.

The generated transformed plants may be propagated by a variety of means, such as by clonal propagation or classical breeding techniques. For example, a first generation (or T1 ) transformed plant may be selfed and homozygous second-generation (or T2) transformants selected, and the T2 plants may then further be propagated through classical breeding techniques. The generated transformed organisms may take a variety of forms. For example, they may be chimeras of transformed cells and non-transformed cells; clonal trans- formants (e.g., all cells transformed to contain the expression cassette); grafts of transformed and untransformed tissues (e.g., in plants, a transformed rootstock grafted to an untransformed scion).

Throughout this application a plant, plant part, seed or plant cell transformed with - or inter- changeably transformed by - a construct or transformed with or by a nucleic acid is to be understood as meaning a plant, plant part, seed or plant cell that carries said construct or said nucleic acid as a transgene due the result of an introduction of this construct or this nucleic acid by biotechnological means. The plant, plant part, seed or plant cell therefore comprises this recombinant construct or this recombinant nucleic acid.

T-DNA activation tagging

"T-DNA activation" tagging (Hayashi et al. Science (1992) 1350-1353), involves insertion of T-DNA, usually containing a promoter (may also be a translation enhancer or an intron), in the genomic region of the gene of interest or 10 kb up- or downstream of the coding region of a gene in a configuration such that the promoter directs expression of the targeted gene. Typically, regulation of expression of the targeted gene by its natural promoter is disrupted and the gene falls under the control of the newly introduced promoter. The promoter is typically embedded in a T-DNA. This T-DNA is randomly inserted into the plant genome, for example, through Agrobacterium infection and leads to modified expression of genes near the inserted T-DNA. The resulting transgenic plants show dominant phenotypes due to modified expression of genes close to the introduced promoter.

TILLING

The term "TILLING" is an abbreviation of "Targeted Induced Local Lesions In Genomes" and refers to a mutagenesis technology useful to generate and/or identify nucleic acids encoding proteins with modified expression and/or activity. TILLING also allows selection of plants carrying such mutant variants. These mutant variants may exhibit modified expression, either in strength or in location or in timing (if the mutations affect the promoter for example). These mutant variants may exhibit higher activity than that exhibited by the gene in its natural form. TILLING combines high-density mutagenesis with high-throughput screening methods. The steps typically followed in TILLING are: (a) EMS mutagenesis (Redei GP and Koncz C (1992) In Methods in Arabidopsis Research, Koncz C, Chua NH, Schell J, eds. Singapore, World Scientific Publishing Co, pp. 16-82; Feldmann et al., (1994) In Mey- erowitz EM, Somerville CR, eds, Arabidopsis. Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY, pp 137-172; Lightner J and Caspar T (1998) In J Martinez-Zapater, J Salinas, eds, Methods on Molecular Biology, Vol. 82. Humana Press, Totowa, NJ, pp 91 - 104); (b) DNA preparation and pooling of individuals; (c) PCR amplification of a region of interest; (d) denaturation and annealing to allow formation of heteroduplexes; (e) DHPLC, where the presence of a heteroduplex in a pool is detected as an extra peak in the chroma- togram; (f) identification of the mutant individual; and (g) sequencing of the mutant PCR product. Methods for TILLING are well known in the art (McCallum et al., (2000) Nat Bio- technol 18: 455-457; reviewed by Stemple (2004) Nat Rev Genet 5(2): 145-50). Homologous recombination

"Homologous recombination" allows introduction in a genome of a selected nucleic acid at a defined selected position. Homologous recombination is a standard technology used rou- finely in biological sciences for lower organisms such as yeast or the moss Physcomitrella. Methods for performing homologous recombination in plants have been described not only for model plants (Offringa et al. (1990) EMBO J 9(10): 3077-84) but also for crop plants, for example rice (Terada et al. (2002) Nat Biotech 20(10): 1030-4; lida and Terada (2004) Curr Opin Biotech 15(2): 132-8), and approaches exist that are generally applicable regardless of the target organism (Miller et al, Nature Biotechnol. 25, 778-785, 2007).

Yield-related Trait(s)

A "Yield related trait" is a trait or feature which is related to plant yield. Yield-related traits may comprise one or more of the following non-limitative list of features: early flowering time, yield, biomass, seed yield, early vigour, greenness index, growth rate, agronomic traits, such as e.g. tolerance to submergence (which leads to increased yield in rice), Water Use Efficiency (WUE), Nitrogen Use Efficiency (NUE), etc.

The term "one or more yield related traits" is to be understood to refer to one yield related trait, or two, or three, or four, or five, or six or seven or eight or nine or ten, or more than ten yield related traits of one plant compared with a control plant.

Reference herein to "enhanced yield-related trait" is taken to mean an increase relative to control plants in a yield-related trait, for instance in early vigour and/or in biomass, of a whole plant or of one or more parts of a plant, which may include (i) aboveground parts, preferably aboveground harvestable parts, and/or (ii) parts below ground, preferably har- vestable parts below ground.

In particular, such harvestable parts are roots such as taproots, stems, beets, tubers, leaves, flowers or seeds.

Throughout the present application the tolerance of and / or the resistance to one or more agrochemicals by a plant, e.g. herbicide tolerance, is not considered a yield-related trait within the meaning of this term of the present application. An altered tolerance of and / or the resistance to one or more agrochemicals by a plant, e.g. improved herbicide tolerance, is not an "enhanced yield-related trait" as used throughout this application.

In a particular embodiment of the present invention, any reference to one or more enhanced yield-related trait(s) is meant to exclude the restoration of the expression and / or activity of the POI polypeptide in a plant in which the expression and / or the activity of the POI poly- peptide has been reduced or disabled when compared to the original wildtype plant or original variety. For example, the overexpression of the POI polypeptide in a knock-out mutant variety of a plant, wherein said POI polypeptide or an orhtologue or paralogue has been knocked-out is not considered enhancing one or more yield-related trait(s) within the meaning of the current invention.

Yield

The term "yield" in general means a measurable produce of economic value, typically related to a specified crop, to an area, and to a period of time. Individual plant parts directly contribute to yield based on their number, size and/or weight, or the actual yield is the yield per square meter for a crop and year, which is determined by dividing total production (includes both harvested and appraised production) by planted square meters.

The terms "yield" of a plant and "plant yield" are used interchangeably herein and are meant to refer to vegetative biomass such as root and/or shoot biomass, to reproductive organs, and/or to propagules such as seeds of that plant. Flowers in maize are unisexual; male inflorescences (tassels) originate from the apical stem and female inflorescences (ears) arise from axillary bud apices. The female inflorescence produces pairs of spikelets on the surface of a central axis (cob). Each of the female spike- lets encloses two fertile florets, one of them will usually mature into a maize kernel once fertilized. Hence a yield increase in maize may be manifested as one or more of the follow- ing: increase in the number of plants established per square meter, an increase in the number of ears per plant, an increase in the number of rows, number of kernels per row, kernel weight, thousand kernel weight, ear length/diameter, increase in the seed filling rate, which is the number of filled florets (i.e. florets containing seed) divided by the total number of florets and multiplied by 100), among others.

Inflorescences in rice plants are named panicles. The panicle bears spikelets, which are the basic units of the panicles, and which consist of a pedicel and a floret. The floret is borne on the pedicel and includes a flower that is covered by two protective glumes: a larger glume (the lemma) and a shorter glume (the palea). Hence, taking rice as an example, a yield in- crease may manifest itself as an increase in one or more of the following: number of plants per square meter, number of panicles per plant, panicle length, number of spikelets per panicle, number of flowers (or florets) per panicle; an increase in the seed filling rate which is the number of filled florets (i.e. florets containing seeds) divided by the total number of florets and multiplied by 100; an increase in thousand kernel weight, among others.

Early flowering time

Plants having an "early flowering time" as used herein are plants which start to flower earlier than control plants. Hence this term refers to plants that show an earlier start of flowering. Flowering time of plants can be assessed by counting the number of days ("time to flower") between sowing and the emergence of a first inflorescence. The "flowering time" of a plant can for instance be determined using the method as described in WO 2007/093444. Early vigour

"Early vigour" refers to active healthy well-balanced growth especially during early stages of plant growth, and may result from increased plant fitness due to, for example, the plants being better adapted to their environment (i.e. optimizing the use of energy resources and partitioning between shoot and root). Plants having early vigour also show increased seedling survival and a better establishment of the crop, which often results in highly uniform fields (with the crop growing in uniform manner, i.e. with the majority of plants reaching the various stages of development at substantially the same time), and often better and higher yield. Therefore, early vigour may be determined by measuring various factors, such as thousand kernel weight, percentage germination, percentage emergence, seedling growth, seedling height, root length, root and shoot biomass and many more.

Increased growth rate

The increased growth rate may be specific to one or more parts of a plant (including seeds), or may be throughout substantially the whole plant. Plants having an increased growth rate may have a shorter life cycle. The life cycle of a plant may be taken to mean the time needed to grow from a mature seed up to the stage where the plant has produced mature seeds, similar to the starting material. This life cycle may be influenced by factors such as speed of germination, early vigour, growth rate, greenness index, flowering time and speed of seed maturation. The increase in growth rate may take place at one or more stages in the life cycle of a plant or during substantially the whole plant life cycle. Increased growth rate during the early stages in the life cycle of a plant may reflect enhanced vigour. The increase in growth rate may alter the harvest cycle of a plant allowing plants to be sown later and/or harvested sooner than would otherwise be possible (a similar effect may be obtained with earlier flowering time). If the growth rate is sufficiently increased, it may allow for the further sowing of seeds of the same plant species (for example sowing and harvesting of rice plants followed by sowing and harvesting of further rice plants all within one conventional growing period). Similarly, if the growth rate is sufficiently increased, it may allow for the further sowing of seeds of different plants species (for example the sowing and harvesting of corn plants followed by, for example, the sowing and optional harvesting of soybean, potato or any other suitable plant). Harvesting additional times from the same rootstock in the case of some crop plants may also be possible. Altering the harvest cycle of a plant may lead to an increase in annual biomass production per square meter (due to an increase in the number of times (say in a year) that any particular plant may be grown and harvested). An increase in growth rate may also allow for the cultivation of transgenic plants in a wider geographical area than their wild-type counterparts, since the territorial limitations for growing a crop are often determined by adverse environmental conditions either at the time of planting (early season) or at the time of harvesting (late season). Such adverse conditions may be avoided if the harvest cycle is shortened. The growth rate may be determined by deriving various parameters from growth curves, such parameters may be: T-Mid (the time taken for plants to reach 50% of their maximal size) and T-90 (time taken for plants to reach 90% of their maximal size), amongst others. Stress resistance

An increase in yield and/or growth rate occurs whether the plant is under non-stress conditions or whether the plant is exposed to various stresses compared to control plants. Plants typically respond to exposure to stress by growing more slowly. In conditions of severe stress, the plant may even stop growing altogether. Mild stress on the other hand is defined herein as being any stress to which a plant is exposed which does not result in the plant ceasing to grow altogether without the capacity to resume growth. Mild stress in the sense of the invention leads to a reduction in the growth of the stressed plants of less than 40%, 35%, 30% or 25%, more preferably less than 20% or 15% in comparison to the control plant under non-stress conditions. Due to advances in agricultural practices (irrigation, fertilization, pesticide treatments) severe stresses are not often encountered in cultivated crop plants. As a consequence, the compromised growth induced by mild stress is often an undesirable feature for agriculture.

"Biotic stress" is understood as the negative impact done to plants by other living organisms, such as bacteria, viruses, fungi, nematodes, insects, other animals or other plants. "Biotic stresses" are typically those stresses caused by pathogens, such as bacteria, viruses, fungi, plants, nematodes and insects, or other animals, which may result in negative effects on plant growth and/ or yield.

"Abiotic stress" is understood as the negative impact of non-living factors on the living plant in a specific environment. Abiotic stresses or environmental stresses may be due to drought or excess water, anaerobic stress, salt stress, chemical toxicity, oxidative stress and hot, cold or freezing temperatures. The "abiotic stress" may be an osmotic stress caused by a water stress, e.g. due to drought, salt stress, or freezing stress. Abiotic stress may also be an oxidative stress or a cold stress. "Freezing stress" is intended to refer to stress due to freezing temperatures, i.e. temperatures at which available water molecules freeze and turn into ice. "Cold stress", also called "chilling stress", is intended to refer to cold temperatures, e.g. temperatures below 10°, or preferably below 5°C, but at which water molecules do not freeze. As reported in Wang et al. (Planta (2003) 218: 1 -14), abiotic stress leads to a series of morphological, physiological, biochemical and molecular changes that adversely affect plant growth and productivity. Drought, salinity, extreme temperatures and oxidative stress are known to be interconnected and may induce growth and cellular damage through simi- lar mechanisms. Rabbani et al. (Plant Physiol (2003) 133: 1755-1767) describes a particularly high degree of "cross talk" between drought stress and high-salinity stress. For example, drought and/or salinisation are manifested primarily as osmotic stress, resulting in the disruption of homeostasis and ion distribution in the cell. Oxidative stress, which frequently accompanies high or low temperature, salinity or drought stress, may cause denaturing of functional and structural proteins. As a consequence, these diverse environmental stresses often activate similar cell signalling pathways and cellular responses, such as the production of stress proteins, up-regulation of anti-oxidants, accumulation of compatible solutes and growth arrest. The term "non-stress" conditions as used herein are those environmental conditions that allow optimal growth of plants. Persons skilled in the art are aware of normal soil conditions and climatic conditions for a given location. Plants with optimal growth conditions, (grown under non-stress conditions) typically yield in increasing order of preference at least 97%, 95%, 92%, 90%, 87%, 85%, 83%, 80%, 77% or 75% of the average production of such plant in a given environment. Average production may be calculated on harvest and/or season basis. Persons skilled in the art are aware of average yield productions of a crop. Increase/Improve/Enhance

The terms "increase", "improve" or "enhance" in the context of a yield-related trait are interchangeable and shall mean in the sense of the application at least a 3%, 4%, 5%, 6%, 7%, 8%, 9% or 10%, preferably at least 15% or 20%, more preferably 25%, 30%, 35% or 40% increase in the yield-related trait(s) (such as but not limited to more yield and/or growth) in comparison to control plants as defined herein.

Seed yield

Increased seed yield may manifest itself as one or more of the following:

a) an increase in seed biomass (total seed weight) which may be on an individual seed basis and/or per plant and/or per square meter;

b) increased number of flowers per plant;

c) increased number of seeds;

d) increased seed filling rate (which is expressed as the ratio between the number of filled florets divided by the total number of florets);

e) increased harvest index, which is expressed as a ratio of the yield of harvestable

parts, such as seeds, divided by the biomass of aboveground plant parts; and f) increased thousand kernel weight (TKW), which is extrapolated from the number of seeds counted and their total weight. An increased TKW may result from an increased seed size and/or seed weight, and may also result from an increase in embryo and/or endosperm size.

The terms "filled florets" and "filled seeds" may be considered synonyms.

An increase in seed yield may also be manifested as an increase in seed size and/or seed volume. Furthermore, an increase in seed yield may also manifest itself as an increase in seed area and/or seed length and/or seed width and/or seed perimeter.

Greenness Index

The "greenness index" as used herein is calculated from digital images of plants. For each pixel belonging to the plant object on the image, the ratio of the green value versus the red value (in the RGB model for encoding color) is calculated. The greenness index is expressed as the percentage of pixels for which the green-to-red ratio exceeds a given threshold. Under normal growth conditions, under salt stress growth conditions, and under reduced nutrient availability growth conditions, the greenness index of plants is measured in the last imaging before flowering. In contrast, under drought stress growth conditions, the greenness index of plants is measured in the first imaging after drought. Biomass

The term "biomass" as used herein is intended to refer to the total weight of a plant or plant part. Total weight can be measured as dry weight, fresh weight or wet weight. Within the definition of biomass, a distinction may be made between the biomass of one or more parts of a plant, which may include any one or more of the following:

- aboveground parts such as but not limited to shoot biomass, seed biomass, leaf biomass, etc.;

aboveground harvestable parts such as but not limited to shoot biomass, seed biomass, leaf biomass, stem biomass, setts etc.;

parts below ground, such as but not limited to root biomass, tubers, bulbs, etc.;

- harvestable parts below ground, such as but not limited to root biomass, tubers, bulbs, etc.;

harvestable parts partially below ground such as but not limited to beets and other hypocotyl areas of a plant, rhizomes, stolons or creeping rootstalks;

vegetative biomass such as root biomass, shoot biomass, etc.;

- reproductive organs; and

propagules such as seed.

In a preferred embodiment throughout this application any reference to "root" as biomass or as harvestable parts or as organ e.g. of increased sugar content is to be understood as a reference to harvestable parts partly inserted in or in physical contact with the ground such as but not limited to beets and other hypocotyl areas of a plant, rhizomes, stolons or creeping root- stalks, but not including leaves, as well as harvestable parts belowground, such as but not limited to root, taproot, tubers or bulbs.

In another embodiment aboveground parts or aboveground harvestable parts or above- ground biomass are to be understood as aboveground vegetative biomass not including seeds and/or fruits.

Marker assisted breeding

Such breeding programmes sometimes require introduction of allelic variation by mutagenic treatment of the plants, using for example EMS mutagenesis; alternatively, the programme may start with a collection of allelic variants of so called "natural" origin caused unintentionally. Identification of allelic variants then takes place, for example, by PCR. This is followed by a step for selection of superior allelic variants of the sequence in question and which give increased yield. Selection is typically carried out by monitoring growth performance of plants containing different allelic variants of the sequence in question. Growth performance may be monitored in a greenhouse or in the field. Further optional steps include crossing plants in which the superior allelic variant was identified with another plant. This could be used, for example, to make a combination of interesting phenotypic features.

Use as probes in (gene mapping)

Use of nucleic acids encoding the protein of interest for genetically and physically mapping the genes requires only a nucleic acid sequence of at least 15 nucleotides in length. These nucleic acids may be used as restriction fragment length polymorphism (RFLP) markers. Southern blots (Sambrook J, Fritsch EF and Maniatis T (1989) Molecular Cloning, A Laboratory Manual) of restriction-digested plant genomic DNA may be probed with the nucleic acids encoding the protein of interest. The resulting banding patterns may then be subject- ed to genetic analyses using computer programs such as MapMaker (Lander et al. (1987) Genomics 1 : 174-181 ) in order to construct a genetic map. In addition, the nucleic acids may be used to probe Southern blots containing restriction endonuclease-treated genomic DNAs of a set of individuals representing parent and progeny of a defined genetic cross. Segregation of the DNA polymorphisms is noted and used to calculate the position of the nucleic acid encoding the protein of interest in the genetic map previously obtained using this population (Botstein et al. (1980) Am. J. Hum. Genet. 32:314-331).

The production and use of plant gene-derived probes for use in genetic mapping is described in Bernatzky and Tanksley (1986) Plant Mol. Biol. Reporter 4: 37-41. Numerous publications describe genetic mapping of specific cDNA clones using the methodology outlined above or variations thereof. For example, F2 intercross populations, backcross populations, randomly mated populations, near isogenic lines, and other sets of individuals may be used for mapping. Such methodologies are well known to those skilled in the art. The nucleic acid probes may also be used for physical mapping (i.e., placement of sequences on physical maps; see Hoheisel et al. In: Non-mammalian Genomic Analysis: A Practical Guide, Academic press 1996, pp. 319-346, and references cited therein).

In another embodiment, the nucleic acid probes may be used in direct fluorescence in situ hybridisation (FISH) mapping (Trask (1991 ) Trends Genet. 7:149-154). Although current methods of FISH mapping favour use of large clones (several kb to several hundred kb; see Laan et al. (1995) Genome Res. 5:13-20), improvements in sensitivity may allow performance of FISH mapping using shorter probes. A variety of nucleic acid amplification-based methods for genetic and physical mapping may be carried out using the nucleic acids. Examples include allele-specific amplification (Kaza- zian (1989) J. Lab. Clin. Med 1 1 :95-96), polymorphism of PCR-amplified fragments (CAPS; Sheffield et al. (1993) Genomics 16:325-332), allele-specific ligation (Landegren et al. (1988) Science 241 :1077-1080), nucleotide extension reactions (Sokolov (1990) Nucleic Acid Res. 18:3671), Radiation Hybrid Mapping (Walter et al. (1997) Nat. Genet. 7:22-28) and Happy Mapping (Dear and Cook (1989) Nucleic Acid Res. 17:6795-6807). For these methods, the sequence of a nucleic acid is used to design and produce primer pairs for use in the amplification reaction or in primer extension reactions. The design of such primers is well known to those skilled in the art. In methods employing PCR-based genetic mapping, it may be necessary to identify DNA sequence differences between the parents of the mapping cross in the region corresponding to the instant nucleic acid sequence. This, however, is generally not necessary for mapping methods.

Plant

The term "plant" as used herein encompasses whole plants, ancestors and progeny of the plants and plant parts, including seeds, shoots, stems, leaves, roots (including tubers), flowers, and tissues and organs, wherein each of the aforementioned comprise the gene/nucleic acid of interest. The term "plant" also encompasses plant cells, suspension cultures, callus tissue, embryos, meristematic regions, gametophytes, sporophytes, pollen and microspores, again wherein each of the aforementioned comprises the gene/nucleic acid of interest.

Plants that are particularly useful in the methods of the invention include all plants which belong to the superfamily Viridiplantae, in particular monocotyledonous and dicotyledonous plants including fodder or forage legumes, ornamental plants, food crops, trees or shrubs selected from the list comprising Acer spp., Actinidia spp., Abelmoschus spp., Agave si- salana, Agropyron spp., Agrostis stolonifera, Allium spp., Amaranthus spp., Ammophila arenaria, Ananas comosus, Annona spp., Apium graveolens, Arachis spp, Artocarpus spp., Asparagus officinalis, Avena spp. (e.g. Avena sativa, Avena fatua, Avena byzantina, Avena fatua var. sativa, Avena hybrida), Averrhoa carambola, Bambusa sp., Benincasa hispida, Bertholletia excelsea, Beta vulgaris, Brassica spp. (e.g. Brassica napus, Brassica rapa ssp. [canola, oilseed rape, turnip rape]), Cadaba farinosa, Camellia sinensis, Canna indica, Cannabis sativa, Capsicum spp., Carex elata, Carica papaya, Carissa macrocarpa, Carya spp., Carthamus tinctorius, Castanea spp., Ceiba pentandra, Cichorium endivia, Cin- namomum spp., Citrullus lanatus, Citrus spp., Cocos spp., Coffea spp., Colocasia esculen- ta, Cola spp., Corchorus sp., Coriandrum sativum, Corylus spp., Crataegus spp., Crocus sativus, Cucurbita spp., Cucumis spp., Cynara spp., Daucus carota, Desmodium spp., Di- mocarpus longan, Dioscorea spp., Diospyros spp., Echinochloa spp., Elaeis (e.g. Elaeis guineensis, Elaeis oleifera), Eleusine coracana, Eragrostis tef, Erianthus sp., Eriobotrya japonica, Eucalyptus sp., Eugenia unifiora, Fagopyrum spp., Fagus spp., Festuca arundina- cea, Ficus carica, Fortunella spp., Fragaria spp., Ginkgo biloba, Glycine spp. (e.g. Glycine max, Soja hispida or Soja max), Gossypium hirsutum, Helianthus spp. (e.g. Helianthus an- nuus), Hemerocallis fulva, Hibiscus spp., Hordeum spp. (e.g. Hordeum vulgare), Ipomoea batatas, Juglans spp., Lactuca sativa, Lathyrus spp., Lens culinaris, Linum usitatissimum, Litchi chinensis, Lotus spp., Luff a acutangula, Lupinus spp., Luzula sylvatica, Lycopersicon spp. (e.g. Lycopersicon esculentum, Lycopersicon lycopersicum, Lycopersicon pyriforme), Macrotyloma spp., Malus spp., Malpighia emarginata, Mammea americana, Mangifera indica, Manihot spp., Manilkara zapota, Medicago sativa, Melilotus spp., Mentha spp., Miscan- thus sinensis, Momordica spp., Morus nigra, Musa spp., Nicotiana spp., Olea spp., Opuntia spp., Ornithopus spp., Oryza spp. (e.g. Oryza sativa, Oryza latifolia), Panicum miliaceum, Panicum virgatum, Passiflora edulis, Pastinaca sativa, Pennisetum sp., Persea spp., Pe- troselinum crispum, Phalaris arundinacea, Phaseolus spp., Phleum pratense, Phoenix spp., Phragmites australis, Physalis spp., Pinus spp., Pistacia vera, Pisum spp., Poa spp., Popu- lus spp., Prosopis spp., Prunus spp., Psidium spp., Punica granatum, Pyrus communis, Quercus spp., Raphanus sativus, Rheum rhabarbarum, Ribes spp., Ricinus communis, Rubus spp., Saccharum spp., Sa// sp., Sambucus spp., Secale cereale, Sesamum spp., Sinapis sp., Solanum spp. ('e.g. Solanum tuberosum, Solanum integrifolium or Solanum lycopersicum), Sorghum bicolor, Spinacia spp., Syzygium spp., Tagetes spp., Tamarindus indica, Theobroma cacao, Trifolium spp., Tripsacum dactyloides, Triticosecale rimpaui, Trit- icum spp. ('e.g. Triticum aestivum, Triticum durum, Triticum turgidum, Triticum hybernum, Triticum macha, Triticum sativum, Triticum monococcum or Triticum vulgare), Tropaeolum minus, Tropaeolum majus, Vaccinium spp., V7c/^'a spp., V/gna spp., Viola odorata, Vitis spp., Zea mays, Zizania palustris, Ziziphus spp., amongst others.

Control plant(s)

The choice of suitable control plants is a routine part of an experimental setup and may include corresponding wild type plants or corresponding plants without the gene of interest. The control plant is typically of the same plant species or even of the same variety as the plant to be assessed. The control plant may also be a nullizygote of the plant to be assessed. Nullizygotes (or null control plants) are individuals missing the transgene by segregation. Further, control plants are grown under equal growing conditions to the growing conditions of the plants of the invention, i.e. in the vicinity of, and simultaneously with, the plants of the invention. A "control plant" as used herein refers not only to whole plants, but also to plant parts, including seeds and seed parts.

Propagation material / Propagule

"Propagation material" or "propagule" is any kind of organ, tissue, or cell of a plant capable of developing into a complete plant. "Propagation material" can be based on vegetative re- production (also known as vegetative propagation, vegetative multiplication, or vegetative cloning) or sexual reproduction. Propagation material can therefore be seeds or parts of the non-reproductive organs, like stem or leave. In particular, with respect to poaceae, suitable propagation material can also be sections of the stem, i.e., stem cuttings (like setts). Stalk

A "stalk" is the stem of a plant belonging the Poaceae, and is also known as the "millable cane". In the context of poaceae "stalk", "stem", "shoot", or "tiller" are used interchangeably.

Sett

A "sett" is a section of the stem of a plant from the Poaceae, which is suitable to be used as propagation material. Synonymous expressions to "sett" are "seed-cane", "stem cutting", "section of the stalk", and "seed piece". Description of figures

The present invention will now be described with reference to the following figures in which: Fig. 1 represents the domain structure of SEQ ID NO: 2 with conserved motifs. The motifs 1 to 4 are indicated with dashed lines below the sequence (Arabic numbers denote the motif number).

Fig. 2 represents a multiple alignment of various PMP polypeptides as provided in Table A using ClustalW (version 2.0.1 1 ). The asterisks indicate selected identical amino acids among the various protein sequences. These alignments can be used for defining further motifs or signature sequences, when using conserved amino acids.

Fig. 3 shows phylogenetic tree of PMP polypeptides as provided in table A. The proteins were aligned using MAFFT (Katoh K, Toh H (2008) Recent developments in the MAFFT multiple sequence alignment program. Briefings in Bioinformatics 9: 286-298) bootstrapped NJ tree calculated with QuickTree (100 repeats, uncorrected)( # QuickTree: Howe et al. (2002), Bioinformatics 18(1 1 ): 1546-7) . A cladogram was drawn using Dendroscope2.0.1 (Huson DH, Richter DC, Rausch C, Dezulian T, Franz M, Rupp R (2007) Dendroscope: An interactive viewer for large phylogenetic trees. BMC Bioinformatics 8: Article No.: 460).

Fig. 4 shows the MATGAT table of Example 3.

Fig. 5 represents the binary vector used for increased expression in Oryza sativa of a PMP- encoding nucleic acid under the control of a rice GOS2 promoter (pGOS2).

Fig. 6 shows an alignment of SEQ ID NO: 2 and SEQ ID NO: 8 using Clustal (version 2.1 , see Larkin MA, Blackshields G, Brown NP, Chenna R, McGettigan PA, McWilliam H, Valentin F, Wallace IM, Wilm A, Lopez R, Thompson JD, Gibson TJ, Higgins DG. (2007). Clustal W and Clustal X version 2.0. Bioinformatics, 23, 2947-2948). The asterisks indicate selected identical amino acids among the two protein sequences. This alignment can be used for defining further motifs or signature sequences, when using conserved amino acids.

Examples

The present invention will now be described with reference to the following examples, which are by way of illustration only. The following examples are not intended to limit the scope of the invention.

In particular, the plants used in the described experiments are used because Arabidopsis, tobacco, rice and corn plants are model plants for the testing of transgenes. They are widely used in the art for the relative ease of testing while having a good transferability of the results to other plants used in agriculture, such as but not limited to maize, wheat, rice, soybean, cotton, oilseed rape including canola, sugarcane, sugar beet and alfalfa, or other di- cot or monocot crops.

Unless otherwise indicated, the present invention employs conventional techniques and methods of plant biology, molecular biology, bioinformatics and plant breedings. DNA manipulation: unless otherwise stated, recombinant DNA techniques are performed according to standard protocols described in (Sambrook (2001 ) Molecular Cloning: a laboratory manual, 3rd Edition Cold Spring Harbor Laboratory Press, CSH, New York) or in Volumes 1 and 2 of Ausubel et al. (1994), Current Protocols in Molecular Biology, Current Pro- tocols. Standard materials and methods for plant molecular work are described in Plant Molecular Biology Labfax (1993) by R.D.D. Croy, published by BIOS Scientific Publications Ltd (UK) and Blackwell Scientific Publications (UK).

Example 1 : Identification of sequences related to SEQ ID NO: 1 and SEQ ID NO: 2

Sequences (full length cDNA, ESTs or genomic) related to SEQ ID NO: 1 and SEQ ID NO: 2 were identified amongst those maintained in the Entrez Nucleotides database at the National Center for Biotechnology Information (NCBI) using database sequence search tools, such as the Basic Local Alignment Tool (BLAST) (Altschul et al. (1990) J. Mol. Biol.

215:403-410; and Altschul et al. (1997) Nucleic Acids Res. 25:3389-3402). The program is used to find regions of local similarity between sequences by comparing nucleic acid or polypeptide sequences to sequence databases and by calculating the statistical significance of matches. For example, the polypeptide encoded by the nucleic acid of SEQ ID NO: 1 was used for the TBLASTN algorithm, with default settings and the filter to ignore low complexity sequences set off. The output of the analysis was viewed by pairwise comparison, and ranked according to the probability score (E-value), where the score reflect the probability that a particular alignment occurs by chance (the lower the E-value, the more significant the hit). In addition to E-values, comparisons were also scored by percentage identity. Percentage identity refers to the number of identical nucleotides (or amino acids) between the two compared nucleic acid (or polypeptide) sequences over a particular length. In some in- stances, the default parameters may be adjusted to modify the stringency of the search. For example the E-value may be increased to show less stringent matches. This way, short nearly exact matches may be identified.

The results were evaluated manually and sequences of plastid movement protein homo- logue selected.

Table A provides a list of nucleic acid sequences related to SEQ ID NO: 1 and SEQ ID NO: 2.

Table A: Examples of PMP nucleic acids and polypeptides:

Name Plant Source Nucleic acid Protein SEQ

SEQ ID NO: ID NO:

PMP Populus trichocarpa 1 2

P.trichocarpa_206815 Populus trichocarpa 3 4

P.trichocarpa_421532 Populus trichocarpa 5 6

A.thaliana_AT1 G42550.1 Arabidopsis thaliana 7 8

G.max_Glyma05g34140.1 Glycine max 9 10 G.max_Glyma08g05550.1 Glycine max 1 1 12

P.vulgaris_TC1 1103 Phaseolus vulgaris 13 14

M.truncatula_AC165438_28.5 Medicago truncatula 15 16

G.max_Glyma09g28340.1 Glycine max 17 18

G.max_Glyma16g33150.1 Glycine max 19 20

V.vinifera_GSVIVT00002921001 Vitis vinifera 21 22

A.lyrata_922817 Arabidopsis lyrata 23 24

C.maculosa_TA4221_215693 Centaurea maculosa 25 26

O.sativa_LOC_Os09g38090.1 Oryza sativa 27 28

S.bicolor_Sb02g032300.1 Sorghum bicolor 29 30

PMP_Variant1 artificial 53 54

PMP_Variant2 artificial 55 56

PMP_Variant3 artificial 57 58

PMP_Variant4 artificial 59 60

PMP_Variant5 artificial 61 62

PMP_Variant6 artificial 63 64

PMP_Variant7 artificial 65 66

PMP_Variant8 artificial 67 68

PMP_Variant9 artificial 69 70

PMP_Variant10 artificial 71 72

The polypeptide sequences of SEQ ID NO: 54, 56, 58, 60, 62, 64, 66, 68, 70 and 72 were artificially designed using SEQ ID NO: 2 as a starting point. They share approximately 70, 75, 80, 85, 90, 92, 95, 96, 97 and 98 percent identity with the sequence of SEQ ID NO: 2, respectively. SEQ ID NO: 53, 55, 57, 59, 61 , 63, 65, 67, 69 and 71 are examples of nucleic acid sequences encoding the polypeptides of SEQ ID NO: 54, 56, 58, 60, 62, 64, 66, 68, 70 and 72, respectively.

Sequences have been tentatively assembled and publicly disclosed by research institutions, such as The Institute for Genomic Research (TIGR; beginning with TA). For instance, the Eukaryotic Gene Orthologs (EGO) database may be used to identify such related sequences, either by keyword search or by using the BLAST algorithm with the nucleic acid sequence or polypeptide sequence of interest. Special nucleic acid sequence databases have been created for particular organisms, e.g. for certain prokaryotic organisms, such as by the Joint Genome Institute. Furthermore, access to proprietary databases, has allowed the identification of novel nucleic acid and polypeptide sequences.

Example 2: Alignment of PMP polypeptide sequences

Alignment of the polypeptide sequences was performed using the ClustalW version 2.0.11 algorithm of progressive alignment (Thompson et al. (1997) Nucleic Acids Res 25:4876- 4882; Chenna et al. (2003). Nucleic Acids Res 31 :3497-3500 & Larkin MA, Blackshields G, Brown NP, Chenna R, McGettigan PA, McWilliam H, Valentin F, Wallace IM, Wilm A, Lopez R, Thompson JD, Gibson TJ, Higgins DG. (2007). Clustal W and Clustal X version 2.0. Bio- informatics, 23, 2947-2948)) with standard setting (slow alignment, similarity matrix:

Gonnet, gap opening penalty 10, gap extension penalty: 0.2). Minor manual editing was done to further optimise the alignment. The PMP polypeptides are aligned in Figure 2.

A phylogenetic tree of PMP polypeptides (Figure 3) was constructed by aligning PMP sequences using MAFFT (Katoh and Toh (2008) - Briefings in Bioinformatics 9:286-298) with default settings. A neighbour-joining tree was calculated using Quick-Tree (Howe et al. (2002), Bioinformatics 18(11 ): 1546-7), 100 bootstrap repetitions. The phylogenetic tree was drawn using Dendroscope (Huson et al. (2007), BMC Bioinformatics 8(1 ):460). Confidence levels for 100 bootstrap repetitions are indicated for major branchings.

Example 3: Calculation of global percentage identity between polypeptide sequences

Global percentages of similarity and identity between full length polypeptide sequences useful in performing the methods of the invention were determined using MatGAT (Matrix Global Alignment Tool) software (BMC Bioinformatics. 2003 4:29. MatGAT: an application that generates similarity/identity matrices using protein or DNA sequences. Campanella JJ, Bitincka L, Smalley J; software hosted by Ledion Bitincka). MatGAT generates similarity/identity matrices for DNA or protein sequences without needing pre-alignment of the da- ta. The program performs a series of pair-wise alignments using the Myers and Miller global alignment algorithm, calculates similarity and identity, and then places the results in a distance matrix.

Results of the MatGAT analysis are shown in Figure 4 with global similarity and identity percentages over the full length of the polypeptide sequences. Sequence similarity is shown in the bottom half of the dividing line and sequence identity is shown in the top half of the diagonal dividing line. Parameters used in the analysis were: Scoring matrix: Blosum62, First Gap: 12, Extending Gap: 2. The sequence identity (in %) between the PMP polypeptide sequences useful in performing the methods of the invention can be as low as 29 %, butis generally higher than 49%) compared to SEQ ID NO: 2.

Like for full length sequences, a MATGAT table based on subsequences of a specific domain, may be generated. Based on a multiple alignment of PMP polypeptides, such as for example the one of Example 2, a skilled person may select conserved sequences and submit as input for a MaTGAT analysis. This approach is useful where overall sequence conservation among PMP proteins is rather low.

Example 4: Identification of domains comprised in polypeptide sequences useful in performing the methods of the invention

The Integrated Resource of Protein Families, Domains and Sites (InterPro) database is an integrated interface for the commonly used signature databases for text- and sequence- based searches. The InterPro database combines these databases, which use different methodologies and varying degrees of biological information about well-characterized proteins to derive protein signatures. Collaborating databases include SWISS-PROT, PRO- SITE, TrEMBL, PRINTS, ProDom and Pfam, Smart and TIGRFAMs. Pfam is a large collection of multiple sequence alignments and hidden Markov models covering many common protein domains and families. Pfam is hosted at the Sanger Institute server in the United Kingdom. Interpro is hosted at the European Bioinformatics Institute in the United Kingdom.

The results of the InterPro scan (see Zdobnov E.M. and Apweiler R.; "InterProScan - an integration platform for the signature-recognition methods in InterPro."; Bioinformatics, 2001 , 17(9): 847-8; InterPro database, Release 37.0, 30 April, 2012) of the polypeptide sequences as represented by SEQ ID NO: 2, 4 and 8 showed that the PFAM domain

PF10358 was detected. A repeat analysis using InterPro database release 41 .0, 13th February 2013 produced EEIG1/EHBP1 N-terminal domain (IPR019448) as a hit. IPR019448 comprises PFAM domain PF10358.

Table B: InterPro scan results (major accession numbers) of the polypeptide sequence as represented by SEQ ID NO: 2.

In one embodiment a PMP polypeptide comprises a conserved domain with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to a conserved domain from amino acid 127 to 274 in SEQ ID NO:2).

Identification of conserved motifs

Conserved patterns were identified with the software tool MEME version 3.5. MEME was developed by Timothy L. Bailey and Charles Elkan, Dept. of Computer Science and Engineering, University of California, San Diego, USA and is described by Timothy L. Bailey and Charles Elkan (Fitting a mixture model by expectation maximization to discover motifs in biopolymers, Proceedings of the Second International Conference on Intelligent Systems for Molecular Biology, pp. 28-36, AAAI Press, Menlo Park, California, 1994). The source code for the stand-alone program is public available from the San Diego Supercomputer centercentre (http://meme.sdsc.edu). Motifs 1 to 3 were created with this tool.

For identifying common motifs in all sequences with the software tool MEME, the following settings are used: -maxsize 500000, -nmotifs 15, -evt 0.001 , -maxw 60, -distance 1 e-3, - minsites number of sequences used for the analysis. Input sequences for MEME are non- aligned sequences in Fasta format. Other parameters are used in the default settings in this software version. Prosite patterns for conserved domains are generated with the software tool Pratt version 2.1 or manually. Pratt was developed by Inge Jonassen, Dept. of Informatics, University of Bergen, Norway and is described by Jonassen et al. (I. Jonassen, J.F.Collins and

D.G.Higgins, Finding flexible patterns in unaligned protein sequences, Protein Science 4 (1995), pp. 1587-1595; I.Jonassen, Effi-cient discovery of conserved patterns using a pattern graph, Submitted to CABIOS Febr. 1997]. The source code (ANSI C) for the standalone program is public available, e.g. at establisched Bioinformatic centers like EBI (European Bioinformatics Institute).

For generating patterns with the software tool Pratt, following settings are used: PL (max Pattern Length): 100, PN (max Nr of Pattern Symbols): 100, PX (max Nr of consecutive x's): 30, FN (max Nr of flexible spacers): 5, FL (max Flexibility): 30, FP (max Flex.Product): 10, ON (max number patterns): 50. Input sequences for Pratt are distinct regions of the protein sequences exhibiting high similarity as identified from software tool MEME. The minimum number of sequences, which have to match the generated patterns (CM, min Nr of Seqs to Match) is set to at least 80% of the provided sequences.

The pattern identified via PROSITE and/or MEME are further processed with program Fuzzpro, as implemented in the "The European Molecular Biology Open Software Suite" (EMBOSS), version 6.3.1.2 (Trends in Genetics 16 (6), 276 (2000)), to arrive at the motifs.

Using the alignment as described in example 3, Motif 4, 5, A, B, 1a, 3a, 3b, 4a, Ba, 1 ^*, 2^*, 3^*, 4^*, 5^*, A^* and B^* were identified manually.

In one embodiment a POI polypeptide comprises a motif with at least 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to any of the motifs 1a, 2, 3b, 4a, 5, A, Ba, 1 ^*, 2^*, 3^*, 4^*, 5^*, A^* and B^*, preferably to any one of the motifs 1*, 2*, 3*, 4*, 5*, A* and B*, contained in SEQ ID NO: 2 as shown by their starting and end positions in figure 1.

Example 5: Topology prediction of the PMP polypeptide sequences

TargetP 1.1 predicts the subcellular location of eukaryotic proteins. The location assignment is based on the predicted presence of any of the N-terminal pre-sequences: chloroplast transit peptide (cTP), mitochondrial targeting peptide (mTP) or secretory pathway signal peptide (SP). Scores on which the final prediction is based are not really probabilities, and they do not necessarily add to one. However, the location with the highest score is the most likely according to TargetP, and the relationship between the scores (the reliability class) may be an indication of how certain the prediction is. The reliability class (RC) ranges from 1 to 5, where 1 indicates the strongest prediction. For the sequences predicted to contain an N-terminal presequence a potential cleavage site can also be predicted. TargetP is maintained at the server of the Technical University of Denmark (see

http://www.cbs.dtu.dk/services/TargetP/ & "Locating proteins in the cell using TargetP, Sig- nalP, and related tools", Olof Emanuelsson, S0ren Brunak, Gunnar von Heijne, Henrik Nielsen, Nature Protocols 2, 953-971 (2007)).

A number of parameters must be selected before analysing a sequence, such as organism group (non-plant or plant), cutoff sets (none, predefined set of cutoffs, or user-specified set of cutoffs), and the calculation of prediction of cleavage sites (yes or no). TargetP settings were: "plant"; cutoff cTP =0; cutoff mTP =0; cutoff SP = 0; cutoff other = 0. Cleavage site predictions included. The results of TargetP 1.1 analysis of the polypeptide sequence as represented by SEQ ID NO: 2 are presented Table C. The "plant" organism group has been selected, no cutoffs defined, and the predicted length of the transit peptide requested. The subcellular localization of the polypeptide sequence as represented by SEQ ID NO: 2 may be the plastid for example a chloroplast or the cytoplasm - a transit peptide to the chloroplast is predicted.

Table C: TargetP 1.1 analysis of the polypeptide sequence as represented by SEQ ID NO: 2

Many other algorithms can be used to perform such analyses, including:

· ChloroP 1.1 hosted on the server of the Technical University of Denmark;

Protein Prowler Subcellular Localisation Predictor version 1.2 hosted on the server of the Institute for Molecular Bioscience, University of Queensland, Brisbane, Australia;

PENCE Proteome Analyst PA-GOSUB 2.5 hosted on the server of the University of

Alberta, Edmonton, Alberta, Canada;

· TMHMM, hosted on the server of the Technical University of Denmark

PSORT (URL: psort.org)

PLOC (Park and Kanehisa, Bioinformatics, 19, 1656-1663, 2003).

Example 6: Cloning of the PMP encoding nucleic acid sequence

The nucleic acid sequence was amplified by PCR using as template a custom-made Popu- lus trichocarpa seedlings cDNA library.

The cDNA library used for cloning was custom made from different tissues (e.g. leaves, roots) of Populus trichocarpa. A young plant of P. trichocarpa used was collected in Belgium. PCR was performed using a commercially available proofreading Taq DNA polymerase in standard conditions, using 200 ng of template in a 50 μΙ PCR mix. The primers used were prm151 15 (SEQ ID NO: 32; sense, start codon in bold):

5' ggggacaagtttgtacaaaaaagcaggcttaaacaatggcaacagatagaaggaat3'

and prm151 16 (SEQ ID NO: 33; reverse, complementary):

5' ggggaccactttgtacaagaaagctgggtttggacaattcttgtcttacc3',

which include the AttB sites for Gateway recombination. The amplified PCR fragment was purified also using standard methods. The first step of the Gateway procedure, the BP reaction, was then performed, during which the PCR fragment recombined in vivo with the pDONR201 plasmid to produce, according to the Gateway terminology, an "entry clone", pPMP. Plasmid pDONR201 was purchased from Invitrogen (part of Life Technologies GmbH, Frankfurter StraBe 129B, 64293 Darmstadt, Germany), as part of the Gateway^® technology. The entry clone comprising SEQ ID NO: 1 was then used in an LR reaction with a destination vector used for Oryza sativa transformation. This vector contained as functional elements within the T-DNA borders: a plant selectable marker; a screenable marker expression cassette; and a Gateway cassette intended for LR in vivo recombination with the nucleic acid sequence of interest already cloned in the entry clone. A rice GOS2 promoter (SEQ ID NO: 31 ) for constitutive expression was located upstream of this Gateway cassette.

After the LR recombination step, the resulting expression vector pGOS2::PMP (Figure 5) was transformed into Agrobacterium strain LBA4044 according to methods well known in the art.

Example 7: Plant transformation

Rice transformation

The Agrobacterium containing the expression vector was used to transform Oryza sativa plants. Mature dry seeds of the rice japonica cultivar Nipponbare were dehusked. Steriliza- tion was carried out by incubating for one minute in 70% ethanol, followed by 30 to 60 minutes, preferably 30 minutes in sodium hypochlorite solution (depending on the grade of contamination), followed by a 3 to 6 times, preferably 4 time wash with sterile distilled water. The sterile seeds were then germinated on a medium containing 2,4-D (callus induction medium). After incubation in light for 6 days scutellum-derived calli is transformed with Ag- robacterium as described herein below.

Agrobacterium strain LBA4404 containing the expression vector was used for co-cultivation. Agrobacterium was inoculated on AB medium with the appropriate antibiotics and cultured for 3 days at 28°C. The bacteria were then collected and suspended in liquid co-cultivation medium to a density (Οϋεοο) of about 1. The calli were immersed in the suspension for 1 to 15 minutes. The callus tissues were then blotted dry on a filter paper and transferred to solidified, co-cultivation medium and incubated for 3 days in the dark at 25°C. After washing away the Agrobacterium, the calli were grown on 2,4-D-containing medium for 10 to 14 days (growth time for indica: 3 weeks) under light at 28°C - 32°C in the presence of a selection agent. During this period, rapidly growing resistant callus developed. After transfer of this material to regeneration media, the embryogenic potential was released and shoots developed in the next four to six weeks. Shoots were excised from the calli and incubated for 2 to 3 weeks on an auxin-containing medium from which they were transferred to soil. Hardened shoots were grown under high humidity and short days in a greenhouse.

Transformation of rice cultivar indica can also be done in a similar way as give above ac- cording to techniques well known to a skilled person.

35 to 90 independent TO rice transformants were generated for one construct. The primary transformants were transferred from a tissue culture chamber to a greenhouse. After a quantitative PCR analysis to verify copy number of the T-DNA insert, only single copy transgenic plants that exhibit tolerance to the selection agent were kept for harvest of T1 seed. Seeds were then harvested three to five months after transplanting. The method yielded single locus transformants at a rate of over 50 % (Aldemita and Hodges1996, Chan et al. 1993, Hiei et al. 1994).

As an alternative, the rice plants may be generated according to the following method: The Agrobacterium containing the expression vector is used to transform Oryza sativa plants. Mature dry seeds of the rice japonica cultivar Nipponbare are dehusked. Sterilization is carried out by incubating for one minute in 70% ethanol, followed by 30 minutes in 0.2% HgCI2, followed by a 6 times 15 minutes wash with sterile distilled water. The sterile seeds are then germinated on a medium containing 2,4-D (callus induction medium). After incubation in the dark for four weeks, embryogenic, scutellum-derived calli are excised and propagated on the same medium. After two weeks, the calli are multiplied or propagated by subculture on the same medium for another 2 weeks. Embryogenic callus pieces are sub- cultured on fresh medium 3 days before co-cultivation (to boost cell division activity). Agrobacterium strain LBA4404 containing the expression vector is used for co-cultivation. Agrobacterium is inoculated on AB medium with the appropriate antibiotics and cultured for

3 days at 28°C. The bacteria are then collected and suspended in liquid co-cultivation medium to a density (OD600) of about 1. The suspension is then transferred to a Petri dish and the calli immersed in the suspension for 15 minutes. The callus tissues are then blot- ted dry on a filter paper and transferred to solidified, co-cultivation medium and incubated for 3 days in the dark at 25°C. Co-cultivated calli are grown on 2,4-D-containing medium for

4 weeks in the dark at 28°C in the presence of a selection agent. During this period, rapidly growing resistant callus islands developed. After transfer of this material to a regeneration medium and incubation in the light, the embryogenic potential is released and shoots de- veloped in the next four to five weeks. Shoots are excised from the calli and incubated for 2 to 3 weeks on an auxin-containing medium from which they are transferred to soil. Hardened shoots are grown under high humidity and short days in a greenhouse. Approximately 35 to 90 independent TO rice transformants are generated for one construct. The primary transformants are transferred from a tissue culture chamber to a greenhouse. After a quantitative PCR analysis to verify copy number of the T-DNA insert, only single copy transgenic plants that exhibit tolerance to the selection agent are kept for harvest of T1 seed. Seeds are then harvested three to five months after transplanting. The method yielded single locus transformants at a rate of over 50 % (Aldemita and Hodges1996, Chan et al. 1993, Hiei et al. 1994).

Example 8: Transformation of other crops

Corn transformation

Transformation of maize (Zea mays) is performed with a modification of the method described by Ishida et al. (1996) Nature Biotech 14(6): 745-50. Transformation is genotype- dependent in corn and only specific genotypes are amenable to transformation and regeneration. The inbred line A188 (University of Minnesota) or hybrids with A188 as a parent are good sources of donor material for transformation, but other genotypes can be used successfully as well. Ears are harvested from corn plant approximately 1 1 days after pollination (DAP) when the length of the immature embryo is about 1 to 1.2 mm. Immature embryos are cocultivated with Agrobacterium tumefaciens containing the expression vector, and transgenic plants are recovered through organogenesis. Excised embryos are grown on callus induction medium, then maize regeneration medium, containing the selection agent (for example imidazolinone but various selection markers can be used). The Petri plates are incubated in the light at 25 °C for 2-3 weeks, or until shoots develop. The green shoots are transferred from each embryo to maize rooting medium and incubated at 25 °C for 2-3 weeks, until roots develop. The rooted shoots are transplanted to soil in the greenhouse. T1 seeds are produced from plants that exhibit tolerance to the selection agent and that contain a single copy of the T-DNA insert.

Wheat transformation

Transformation of wheat is performed with the method described by Ishida et al. (1996) Nature Biotech 14(6): 745-50. The cultivar Bobwhite (available from CIMMYT, Mexico) is commonly used in transformation. Immature embryos are co-cultivated with Agrobacterium tumefaciens containing the expression vector, and transgenic plants are recovered through organogenesis. After incubation with Agrobacterium, the embryos are grown in vitro on cal- lus induction medium, then regeneration medium, containing the selection agent (for example imidazolinone but various selection markers can be used). The Petri plates are incubated in the light at 25 °C for 2-3 weeks, or until shoots develop. The green shoots are transferred from each embryo to rooting medium and incubated at 25 °C for 2-3 weeks, until roots develop. The rooted shoots are transplanted to soil in the greenhouse. T1 seeds are produced from plants that exhibit tolerance to the selection agent and that contain a single copy of the T-DNA insert. Soybean transformation

Soybean is transformed according to a modification of the method described in the Texas A&M patent US 5,164,310. Several commercial soybean varieties are amenable to transformation by this method. The cultivar Jack (available from the Illinois Seed foundation) is commonly used for transformation. Soybean seeds are sterilised for in vitro sowing. The hypocotyl, the radicle and one cotyledon are excised from seven-day old young seedlings. The epicotyl and the remaining cotyledon are further grown to develop axillary nodes. These axillary nodes are excised and incubated with Agrobacterium tumefaciens containing the expression vector. After the cocultivation treatment, the explants are washed and trans- ferred to selection media. Regenerated shoots are excised and placed on a shoot elongation medium. Shoots no longer than 1 cm are placed on rooting medium until roots develop. The rooted shoots are transplanted to soil in the greenhouse. T1 seeds are produced from plants that exhibit tolerance to the selection agent and that contain a single copy of the T- DNA insert.

Rapeseed/canola transformation

Cotyledonary petioles and hypocotyls of 5-6 day old young seedling are used as explants for tissue culture and transformed according to Babic et al. (1998, Plant Cell Rep 17: 183- 188). The commercial cultivar Westar (Agriculture Canada) is the standard variety used for transformation, but other varieties can also be used. Canola seeds are surface-sterilized for in vitro sowing. The cotyledon petiole explants with the cotyledon attached are excised from the in vitro seedlings, and inoculated with Agrobacterium (containing the expression vector) by dipping the cut end of the petiole explant into the bacterial suspension. The explants are then cultured for 2 days on MSBAP-3 medium containing 3 mg/l BAP, 3 % sucrose, 0.7 % Phytagar at 23 °C, 16 hr light. After two days of co-cultivation with Agrobacterium, the petiole explants are transferred to MSBAP-3 medium containing 3 mg/l BAP, cefotaxime, car- benicillin, or timentin (300 mg/l) for 7 days, and then cultured on MSBAP-3 medium with cefotaxime, carbenicillin, or timentin and selection agent until shoot regeneration. When the shoots are 5 - 10 mm in length, they are cut and transferred to shoot elongation medium (MSBAP-0.5, containing 0.5 mg/l BAP). Shoots of about 2 cm in length are transferred to the rooting medium (MS0) for root induction. The rooted shoots are transplanted to soil in the greenhouse. T1 seeds are produced from plants that exhibit tolerance to the selection agent and that contain a single copy of the T-DNA insert. Alfalfa transformation

A regenerating clone of alfalfa (Medicago sativa) is transformed using the method of (McKersie et al., 1999 Plant Physiol 119: 839-847). Regeneration and transformation of alfalfa is genotype dependent and therefore a regenerating plant is required. Methods to obtain regenerating plants have been described. For example, these can be selected from the cultivar Rangelander (Agriculture Canada) or any other commercial alfalfa variety as described by Brown DCW and A Atanassov (1985. Plant Cell Tissue Organ Culture 4: 11 1 - 1 12). Alternatively, the RA3 variety (University of Wisconsin) has been selected for use in tissue culture (Walker et al., 1978 Am J Bot 65:654-659). Petiole explants are cocultivated with an overnight culture of Agrobacterium tumefaciens C58C1 pMP90 (McKersie et al., 1999 Plant Physiol 119: 839-847) or LBA4404 containing the expression vector. The ex- plants are cocultivated for 3 d in the dark on SH induction medium containing 288 mg/ L Pro, 53 mg/ L thioproline, 4.35 g/ L K2S04, and 100 μιη acetosyringinone. The explants are washed in half-strength Murashige-Skoog medium (Murashige and Skoog, 1962) and plated on the same SH induction medium without acetosyringinone but with a suitable selection agent and suitable antibiotic to inhibit Agrobacterium growth. After several weeks, somatic embryos are transferred to BOi2Y development medium containing no growth regulators, no antibiotics, and 50 g/ L sucrose. Somatic embryos are subsequently germinated on half- strength Murashige-Skoog medium. Rooted seedlings were transplanted into pots and grown in a greenhouse. T1 seeds are produced from plants that exhibit tolerance to the selection agent and that contain a single copy of the T-DNA insert. Cotton transformation

Cotton is transformed using Agrobacterium tumefaciens according to the method described in US 5,159,135. Cotton seeds are surface sterilised in 3% sodium hypochlorite solution during 20 minutes and washed in distilled water with 500 g/ml cefotaxime. The seeds are then transferred to SH-medium with 50 g/ml benomyl for germination. Hypocotyls of 4 to 6 days old seedlings are removed, cut into 0.5 cm pieces and are placed on 0.8% agar. An Agrobacterium suspension (approx. 108 cells per ml, diluted from an overnight culture transformed with the gene of interest and suitable selection markers) is used for inoculation of the hypocotyl explants. After 3 days at room temperature and lighting, the tissues are transferred to a solid medium (1.6 g/l Gelrite) with Murashige and Skoog salts with B5 vita- mins (Gamborg et al., Exp. Cell Res. 50:151-158 (1968)), 0.1 mg/l 2,4-D, 0.1 mg/l 6- furfurylaminopu rine and 750 ug/ml MgCL2, and with 50 to 100 ug/ml cefotaxime and 400- 500 g/ml carbenicillin to kill residual bacteria. Individual cell lines are isolated after two to three months (with subcultures every four to six weeks) and are further cultivated on selective medium for tissue amplification (30°C, 16 hr photoperiod). Transformed tissues are subsequently further cultivated on non-selective medium during 2 to 3 months to give rise to somatic embryos. Healthy looking embryos of at least 4 mm length are transferred to tubes with SH medium in fine vermiculite, supplemented with 0.1 mg/l indole acetic acid, 6 furfu- rylaminopurine and gibberellic acid. The embryos are cultivated at 30°C with a photoperiod of 16 hrs, and plantlets at the 2 to 3 leaf stage are transferred to pots with vermiculite and nutrients. The plants are hardened and subsequently moved to the greenhouse for further cultivation.

Sugarbeet transformation

Seeds of sugarbeet (Beta vulgaris L.) are sterilized in 70% ethanol for one minute followed by 20 min. shaking in 20% Hypochlorite bleach e.g. Clorox® regular bleach (commercially available from Clorox, 1221 Broadway, Oakland, CA 94612, USA). Seeds are rinsed with sterile water and air dried followed by plating onto germinating medium (Murashige and Skoog (MS) based medium (Murashige, T., and Skoog, ., 1962. Physiol. Plant, vol. 15, 473- 497) including B5 vitamins (Gamborg et al.; Exp. Cell Res., vol. 50, 151 -8.) supplemented with 10 g/l sucrose and 0,8% agar). Hypocotyl tissue is used essentially for the initiation of shoot cultures according to Hussey and Hepher (Hussey, G., and Hepher, A., 1978. Annals of Botany, 42, 477-9) and are maintained on MS based medium supplemented with 30g/l sucrose plus 0,25mg/l benzylamino purine and 0,75% agar, pH 5,8 at 23-25°C with a 16- hour photoperiod. Agrobacterium tumefaciens strain carrying a binary plasmid harbouring a selectable marker gene, for example nptll, is used in transformation experiments. One day before transformation, a liquid LB culture including antibiotics is grown on a shaker (28°C, 150rpm) until an optical density (O.D.) at 600 nm of ~1 is reached. Overnight-grown bacterial cultures are centrifuged and resuspended in inoculation medium (O.D. ~1 ) including Acetosyringone, pH 5,5. Shoot base tissue is cut into slices (1.0 cm x 1.0 cm x 2.0 mm approximately). Tissue is immersed for 30s in liquid bacterial inoculation medium. Excess liquid is removed by filter paper blotting. Co-cultivation occurred for 24-72 hours on MS based medium incl. 30g/l sucrose followed by a non-selective period including MS based medium, 30g/l sucrose with 1 mg/l BAP to induce shoot development and cefotaxim for eliminating the Agrobacterium. After 3-10 days explants are transferred to similar selective medium harbouring for example kanamycin or G418 (50-100 mg/l genotype dependent). Tissues are transferred to fresh medium every 2-3 weeks to maintain selection pressure. The very rapid initiation of shoots (after 3-4 days) indicates regeneration of existing meristems rather than organogenesis of newly developed transgenic meristems. Small shoots are transferred after several rounds of subculture to root induction medium containing 5 mg/l NAA and kanamycin or G418. Additional steps are taken to reduce the potential of generating transformed plants that are chimeric (partially transgenic). Tissue samples from regenerated shoots are used for DNA analysis. Other transformation methods for sugarbeet are known in the art, for example those by Linsey & Gallois (Linsey, K., and Gallois, P., 1990. Journal of Experimental Botany; vol. 41 , No. 226; 529-36) or the methods published in the international application published as W09623891A. Sugarcane transformation

Spindles are isolated from 6-month-old field grown sugarcane plants (Arencibia et al., 1998. Transgenic Research, vol. 7, 213-22; Enriquez-Obregon et al., 1998. Planta, vol. 206, 20- 27). Material is sterilized by immersion in a 20% Hypochlorite bleach e.g. Clorox® regular bleach (commercially available from Clorox, 1221 Broadway, Oakland, CA 94612, USA) for 20 minutes. Transverse sections around 0,5cm are placed on the medium in the top-up direction. Plant material is cultivated for 4 weeks on MS (Murashige, T., and Skoog, ., 1962. Physiol. Plant, vol. 15, 473-497) based medium incl. B5 vitamins (Gamborg, O., et al., 1968. Exp. Cell Res., vol. 50, 151 -8) supplemented with 20g/l sucrose, 500 mg/l casein hydroly- sate, 0,8% agar and 5mg/l 2,4-D at 23°C in the dark. Cultures are transferred after 4 weeks onto identical fresh medium. Agrobacterium tumefaciens strain carrying a binary plasmid harbouring a selectable marker gene, for example hpt, is used in transformation experiments. One day before transformation, a liquid LB culture including antibiotics is grown on a shaker (28°C, 150rpm) until an optical density (O.D.) at 600 nm of -0,6 is reached. Overnight-grown bacterial cultures are centrifuged and resuspended in MS based inoculation medium (O.D. -0,4) including acetosyringone, pH 5,5. Sugarcane embryogenic callus pieces (2-4 mm) are isolated based on morphological characteristics as compact structure and yellow colour and dried for 20 min. in the flow hood followed by immersion in a liquid bacterial inoculation medium for 10-20 minutes. Excess liquid is removed by filter paper blotting. Co-cultivation occurred for 3-5 days in the dark on filter paper which is placed on top of MS based medium incl. B5 vitamins containing 1 mg/l 2,4-D. After co-cultivation calli are washed with sterile water followed by a non-selective cultivation period on similar medium containing 500 mg/l cefotaxime for eliminating remaining Agrobacterium cells. After 3-10 days explants are transferred to MS based selective medium incl. B5 vitamins containing 1 mg/l 2,4-D for another 3 weeks harbouring 25 mg/l of hygromycin (genotype dependent). All treatments are made at 23°C under dark conditions. Resistant calli are further cultivated on medium lacking 2,4-D including 1 mg/l BA and 25 mg/l hygromycin under 16 h light photo- period resulting in the development of shoot structures. Shoots are isolated and cultivated on selective rooting medium (MS based including, 20g/l sucrose, 20 mg/l hygromycin and 500 mg/l cefotaxime). Tissue samples from regenerated shoots are used for DNA analysis. Other transformation methods for sugarcane are known in the art, for example from the international application published as WO2010/151634A and the granted European patent EP1831378.

For transformation by particle bombardment the induction of callus and the transformation of sugarcane can be carried out by the method of Snyman et al. (Snyman et al., 1996, S. Afr. J. Bot 62, 151 -154). The construct can be cotransformed with the vector pEmuKN, which expressed the npt[pi] gene (Beck et al. Gene 19, 1982, 327-336; Gen-Bank Accession No. V00618) under the control of the pEmu promoter (Last et al. (1991 ) Theor. Appl. Genet. 81 , 581 -588). Plants are regenerated by the method of Snyman et al. 2001 (Acta Horticulturae 560, (2001), 105-108). Example 9: Phenotypic evaluation procedure

9.1 Evaluation setup

35 to 90 independent TO rice transformants were generated. The primary transformants were transferred from a tissue culture chamber to a greenhouse for growing and harvest of T1 seed. Six events, of which the T1 progeny segregated 3:1 for presence/absence of the transgene, were retained. For each of these events, approximately 10 T1 seedlings containing the transgene (hetero- and homo-zygotes) and approximately 10 T1 seedlings lacking the transgene (nullizygotes) were selected by monitoring visual marker expression. The transgenic plants and the corresponding nullizygotes were grown side-by-side at random positions. Greenhouse conditions were of shorts days (12 hours light), 28°C in the light and 22°C in the dark, and a relative humidity of 70%. Plants grown under non-stress conditions were watered at regular intervals to ensure that water and nutrients were not limiting and to satisfy plant needs to complete growth and development, unless they were used in a stress screen.

From the stage of sowing until the stage of maturity the plants were passed several times through a digital imaging cabinet. At each time point digital images (2048x1536 pixels, 16 million colours) were taken of each plant from at least 6 different angles.

T1 events can be further evaluated in the T2 generation following the same evaluation procedure as for the T1 generation, e.g. with less events and/or with more individuals per event.

Drought screen

T1 or T2 plants are grown in potting soil under normal conditions until they approached the heading stage. They are then transferred to a "dry" section where irrigation is withheld. Soil moisture probes are inserted in randomly chosen pots to monitor the soil water content (SWC). When SWC goes below certain thresholds, the plants are automatically re-watered continuously until a normal level is reached again. The plants are then re-transferred again to normal conditions. The rest of the cultivation (plant maturation, seed harvest) is the same as for plants not grown under abiotic stress conditions. Growth and yield parameters are recorded as detailed for growth under normal conditions.

Nitrogen use efficiency screen

T1 or T2 plants are grown in potting soil under normal conditions except for the nutrient solution. The pots are watered from transplantation to maturation with a specific nutrient solution containing reduced N nitrogen (N) content, usually between 7 to 8 times less. The rest of the cultivation (plant maturation, seed harvest) is the same as for plants not grown under abiotic stress. Growth and yield parameters are recorded as detailed for growth under normal conditions.

Salt stress screen

T1 or T2 plants are grown on a substrate made of coco fibers and particles of baked clay (Argex) (3 to 1 ratio). A normal nutrient solution is used during the first two weeks after transplanting the plantlets in the greenhouse. After the first two weeks, 25 mM of salt (NaCI) is added to the nutrient solution, until the plants are harvested. Growth and yield parameters are recorded as detailed for growth under normal conditions.

9.2 Statistical analysis: F test

A two factor ANOVA (analysis of variants) was used as a statistical model for the overall evaluation of plant phenotypic characteristics. An F test was carried out on all the parameters measured of all the plants of all the events transformed with the gene of the present invention. The F test was carried out to check for an effect of the gene over all the transformation events and to verify for an overall effect of the gene, also known as a global gene effect. The threshold for significance for a true global gene effect was set at a 5% probabil- ity level for the F test. A significant F test value points to a gene effect, meaning that it is not only the mere presence or position of the gene that is causing the differences in phenotype.

9.3 Parameters measured

From the stage of sowing until the stage of maturity the plants were passed several times through a digital imaging cabinet. At each time point digital images (2048x1536 pixels, 16 million colours) were taken of each plant from at least 6 different angles as described in WO2010/031780. These measurements were used to determine different parameters. Biomass-related parameter measurement

The biomass of aboveground plant parts was determined by measuring plant aboveground area (or green biomass) which was determined by counting the total number of pixels on the digital images from aboveground plant parts discriminated from the background ("Area Max") . This value was averaged for the pictures taken on the same time point from the different angles and was converted to a physical surface value expressed in square mm by calibration. Experiments show that the aboveground plant area measured this way correlates with the biomass of plant parts above ground. The above ground area is the area measured at the time point at which the plant had reached its maximal green biomass.

Increase in root biomass is expressed as an increase in total root biomass (measured as maximum biomass of roots observed during the lifespan of a plant, "RootMax"); or as an increase in the root/shoot index ("RootShlnd"), measured as the ratio between root mass and shoot mass in the period of active growth of root and shoot. In other words, the root/shoot index is defined as the ratio of the rapidity of root growth to the rapidity of shoot growth in the period of active growth of root and shoot. This parameter is an indication or root biomass and development.

Root biomass can be determined using a method as described in WO 2006/029987. Also, the diameter of the roots, the amount of roots above a certain thickness level and below a certain thinness level can be measured.

The absolute height can be measured ("HeightMax"). An alternative robust indication of the height of the plant is the measurement of the location of the centre of gravity, i.e. determining the height (in mm) of the gravity centre of the above-ground, green biomass. This avoids influence by a single erect leaf, based on the asymptote of curve fitting or, if the fit is not satisfactory, based on the absolute maximum("GravityYMax").

Parameters related to development time

The early vigour is the plant aboveground area three weeks post-germination. Early vigour was determined by counting the total number of pixels from aboveground plant parts discriminated from the background. This value was averaged for the pictures taken on the same time point from different angles and was converted to a physical surface value expressed in square mm by calibration.

The relative growth rate (RGR) as the natural logarithm of the above ground biomass measured (called TotalArea') at a second time point, minus the natural logarithm of the above ground biomass at a first time point, divided by the number of days between those two time points ([log(TotalArea2)-log(TotalArea1)]/ndays). The time points are the same for all plants in one experiment. The first time point is chosen as the earliest measurement taken between 25 and 41 days after planting. If the number of measurements (plants) at that time point in that experiment is less than one third of the maximum number of measurements taken per time point for that experiment, then the next time point is taken (again with the same restriction on the number of measurements). The second time point is simply the next time point (with the same restriction on the number of measurements). AreaEmer is an indication of quick early development when this value is decreased compared to control plants. It is the ratio (expressed in %) between the time a plant needs to make 30 % of the final biomass and the time needs to make 90 % of its final biomass.

The "time to flower" (TTF) or "flowering time" of the plant can be determined using the method as described in WO 2007/093444.

Seed-related parameter measurements

The mature primary panicles were harvested, counted, bagged, barcode-labelled and then dried for three days in an oven at 37°C. The panicles were then threshed and all the seeds were collected and counted. The seeds are usually covered by a dry outer covering, the husk. The filled husks (herein also named filled florets) were separated from the empty ones using an air-blowing device. The empty husks were discarded and the remaining fraction was counted again. The filled husks were weighed on an analytical balance.

The total number of seeds was determined by counting the number of filled husks that re- mained after the separation step. The total seed weight was measured by weighing all filled husks harvested from a plant.

The total number of seeds (or florets) per plant was determined by counting the number of husks (whether filled or not) harvested from a plant.

Thousand Kernel Weight (TKW) is extrapolated from the number of seeds counted and their total weight.

The Harvest Index (HI) in the present invention is defined as the ratio between the total seed weight and the above ground area (mm²), multiplied by a factor 10⁶.

The number of flowers per panicle as defined in the present invention is the ratio between the total number of seeds over the number of mature primary panicles.

The "seed fill rate" or "seed filling rate" as defined in the present invention is the proportion (expressed as a %) of the number of filled seeds (i.e. florets containing seeds) over the total number of seeds (i.e. total number of florets). In other words, the seed filling rate is the percentage of florets that are filled with seed.

Example 10: Results of the phenotypic evaluation of the transgenic plants

The results of the evaluation of transgenic rice plants in the T1 generation and expressing a nucleic acid encoding the PMP polypeptide of SEQ ID NO: 2 under non-stress conditions are presented below in Table D. When grown under non-stress conditions, an increase of at least 5 % was observed for aboveground biomass (AreaMax), root biomass (RootMax), and for seed yield (including total weight of seeds (totalwgseeds), number of florets of a plant (nrtotalseed), number of filled seeds of a plant (nrfilledseed)) and the relative growth rate (RGR). An increase in thin roots was observed in 50 percent of the plants, and an increase in thick roots in at least 16 percent of the plants. Interestingly, the plants showing the increase in thick roots also had an increase in thin roots together with the strongest increase in total root biomass (18 percent) and the strongest aboveground biomass gain (AreaMax: + 18 percent).

Half of the events showed a modified shoot to root index, with one event showing an increase, 3 being neutral and 2 showing a decrease, and a third of the events showed a strong increase of 15 to 20 percent in the Harvest Index. In addition, plants expressing a PMP nucleic acid showed an increase in the average number of florets per panicle on a plant, in the number of panicles in the first flush, the height of the plants, the height of the centre of gravity of the plants, in late greenness and early greenness and a faster early development (AreaEmer) in at least 1 event, although one other event showed a slower early development. Table D: Data summary for transgenic rice plants; for each parameter, the overall percent increase is shown for T1 generation plants, for each parameter the p-value is <0.05.

Various methods to assess if a particular protein plays a role in plastid movement in response to known stimuli such as but not limited to blue light reaction and to different light intensities have been described.

For example, Knock-out plants for a sequence of interest can be generated or ordered from collections, e.g. T-DNA knock-out collections at the Arabidopsis Biological Resource Center, 1060 Carmack Road, Rightmire Hall, room 055, Columbus, OH 43210, USA. Other techniques to decrease or eliminate the expression and/or activity of a protein are known in the art, for example antisense expression, RNAi, miRNA, antibody capturing of a protein of interest. Plants and plant cells with unaltered expression and/or activity of the sequence in question can serve as controls, or the decreased expression and/or activity can be restored to have control plants or plant cells.

The assessment of plastid movement and its alterations are known in the art and some are summarised in the publication of a doctorate thesis by Serena Schmidt von Braun („Chup1 - a chloroplast movement protein and its interactions." PhD thesis, Serena Schmidt von Braun (2008) Fakultat fur Biologie der Ludwig-Maximilians-Universitat Munchen, Munich, Germany; http://edoc.ub. uni-muenchen.de/8745/1/Schmidt_von_Braun_Serena.pdf)

Claims

ims

Method for enhancing one or more yield-related traits in plants relative to control plants, comprising the steps of increasing expression in a plant of a nucleic acid encoding a polypeptide and growing the plant, wherein said polypeptide comprises (i) all of the following motifs:

Motif 1a (SEQ ID NO 35):

[M/V/I][P/A/G/S][L/I/M/T][D/E][E/D][L/M/V][L/I/V/M]GKT[A/G]E[Q/H][I/V]AFEG[I/M

T] AA[R/Q/E] [T/l/S/A] [l/V] [A/S/T]

or alternatively Motif 1 (SEQ ID NO: 34):

Motif 2 (SEQ ID NO: 36):

Motif 3b (SEQ ID NO: 39):

[S/K/E/L/V][K/E/S/A][G/D/E/S][K/Q/P/E/H/N][D/E][L/V/M/I/F/Q]LWS[I/L/M]SSR[I/V

][M/V]ADMWL[K/R][P/T/S/H][M/I/L]RNPD[V/I][K/N/I]

or alternatively Motif 3 (SEQ ID NO: 37):

[S/K/E/L/V][K/E/S/A][G/D/E/S]QQ[K/Q/P/E/H/N][D/E][L/V/M/I/F/Q]LWS[I/L/M]SS

R[I/V][M/V]ADMWL[K/R][P/T/S/H][M/I/L]RNPD[V/I][K/N/I]

or alternatively Motif 3a (SEQ ID NO 38):

Motif 4a (SEQ ID NO: 41 ):

M[A/G/S][T/N/S/V][A/I/G][M/T/L/I][S/N/T][T/S/D/Y][G/S]R[K/Q/N][E/D]RI[S/T/A/M/

D][T/S]G[I/L]WN[V/M/I/A][N/D/E/S/H/Q][E/D][N/T/E/D/S]P[L/V/F]T[A/V/G/S][E/D][

K][A/G]LK[I/V]Q[A/V][E/D/G][I/M/V][A/V/S/T][E/D/K][E/D]

or alternatively Motif 4(SEQ ID NO: 40):

Motif 5 (SEQ ID NO: 42):

Motif A (SEQ ID NO: 43):

M[Q/H/N][K/R][L/M][S/G]CLFSVEVV[A/T/I][V/A][Q/E][G/N/D]LP[A/S]SMNGLRL[S

/A/G]V[C/A/S]VRKKET[K/R][D/E]G[A/S][V/M][N/Q/H/K]TMP[S/C]RV[S/D/A/H][Q/

L/H]G[A/S/G][G/A]DFEET[L/M]F[I/V/L][K/R][C/S][H/N][V/L/A]Y; and

Motif Ba (SEQ ID NO 45):

[K/R/T]FE[Q/P/A/S]R[P/V/L]F[F/W/M/S/L][I/L/V/F][Y/S][V/L/A][F/V][A/S]V[D/E]A[E

/D/K/Q/P][A/E]L[D/E/S][F/L]GR[T/S/H/N][S/Y/I/L/A]VDLS[E/Q/L/R]L[I/V][Q/K/R]E

S[I/V/M/T/S][E/D/G][K/R][S/N][Q/A/Y][E/Q][G/D][T/L/A/M/E]R[V/L]RQWD[T/M/R][

S/N/A][F/W/L][S/N/G/P/K]L[S/A]GKAKGGEL[V/A/I][L/V]KL[G/S/A]FQIM[E/D][K/D]

[E/D/G]G[G/V][I/V/A/G]

or alternatively Motif B (SEQ ID NO: 44):

[K/R/T]FE[Q/P/A/S]R[P/V/L]F[F/W/M/S/L][I/L/V/F][Y/S][V/L/A][F/V][A/S]V[D/E]A[E

/D/K/Q/P][A/E]L[D/E/S][F/L]GR[T/S/H/N][S/Y/I/L/A]VDLS[E/Q/L/R]L[I/V][Q/K/R]E

S[I/V/M/T/S][E/D/G][K/R]M[S/N][Q/A/Y][E/Q][G/D][T/L/A/M/E]R[V/L]RQWD[T/M/R

][S/N/A][F/W/L][S/N/G/P/K]L[S/A]GKAKGGEL[V/A/I][L/V]KL[G/S/A]FQIM[E/D][K/

D][E/D/G]G[G/V][I/V/A/G]; or

(ii) any 6 of the motifs listed under (i) ; or

(iii) any 5 of the motifs listed under (i); or

(iv) any 4 of the motifs listed under (i); or

(v) any 3 of the motifs listed under (i); or

(vi) Motifs 1 a, 2, 3b, 4a and 5 as described herein above; or

(vii) Motifs A and Ba as described herein above; or

(viii) any 4 of the motifs 1a, 2, 3b, 4a and 5 as described herein above; or

(ix) Motifs 1a, 2 and 3b as described herein above; or

(x) Motifs 4a and 5 as described herein above; or

(xi) A combination of (vi) and (vii) or (vii) and (ix) or (vii) and (x) above.

A method for enhancing one or more yield-related traits in plants relative to control plants, comprising the steps of increasing expression in a plant of a nucleic acid en- coding a polypeptide and growing the plant, wherein said polypeptide comprises PFAM domain PF10358.

Method for enhancing one or more yield-related traits in plants relative to control plants, comprising the steps of increasing expression in a plant of a nucleic acid encoding a polypeptide and growing the plant, wherein said polypeptide is selected from the group consisting of:

A method for enhancing one or more yield-related traits in plants relative to control plants, comprising the steps of increasing expression in a plant of a nucleic acid encoding a polypeptide and growing the plant, wherein said polypeptide comprises PFAM domain PF10358 and wherein said polypeptide comprises

(i) all of the following motifs:

Motif 1a (SEQ ID NO 35):

[M/V/I][P/A/G/S][L/I/M/T][D/E][E/D][L/M/V][L/I/V/M]GKT[A/G]E[Q/H][I/V]AFEG[I/M

T] AA[R/Q/E] [T/l/S/A] [l/V] [A/S/T]

or alternatively Motif 1 (SEQ ID NO: 34):

Motif 3b (SEQ ID NO: 39):

[S/K/E/L/V][K/E/S/A][G/D/E/S][K/Q/P/E/H/N][D/E][L/V/M/I/F/Q]LWS[I/L/M]SSR[I/V

][M/V]ADMWL[K/R][P/T/S/H][M/I/L]RNPD[V/I][K/N/I]

or alternatively Motif 3 (SEQ ID NO: 37):

[S/K/E/L/V][K/E/S/A][G/D/E/S]QQ[K/Q/P/E/H/N][D/E][L/V/M/I/F/Q]LWS[I/L/M]SS

R[I/V][M/V]ADMWL[K/R][P/T/S/H][M/I/L]RNPD[V/I][K/N/I]

or alternatively Motif 3a (SEQ ID NO 38):

Motif 4a (SEQ ID NO: 41):

M[A/G/S][T/N/S/V][A/I/G][M/T/L/I][S/N/T][T/S/D/Y][G/S]R[K/Q/N][E/D]RI[S/T/A/M/

D][T/S]G[I/L]WN[V/M/I/A][N/D/E/S/H/Q][E/D][N/T/E/D/S]P[L/V/F]T[A/V/G/S][E/D][

K][A/G]LK[I/V]Q[A/V][E/D/G][I/M/V][A/V/S/T][E/D/K][E/D]

or alternatively Motif 4(SEQ ID NO: 40):

Motif 5 (SEQ ID NO: 42):

[V/L/A/F][V/T][V/I/A]Q[L/M]RDP[I/L/M/T]R[R/Q][Y/F]E[A/S/E]VG[G/A][P/T][V/M/L/ S][V/M/I][A/V][V/L/I][V/L/I][H/Q]A[TA//E]; and

Motif A (SEQ ID NO: 43):

M[Q/H/N][K/R][L/M][S/G]CLFSVEVV[A/T/I][V/A][Q/E][G/N/D]LP[A/S]SMNGLRL[S

/A/G]V[C/A/S]VRKKET[K/R][D/E]G[A/S][V/M][N/Q/H/K]TMP[S/C]RV[S/D/A/H][Q/

L/H]G[A/S/G][G/A]DFEET[L/M]F[I/V/L][K/R][C/S][H/N][V/L/A]Y; and

Motif Ba (SEQ ID NO 45):

S/N/A][F/W/L][S/N/G/P/K]L[S/A]GKAKGGEL[V/A/I][L/V]KL[G/S/A]FQIM[E/D][K/D]

[E/D/G]G[G/V][I/V/A/G]

or alternatively Motif B (SEQ ID NO: 44):

[K/R/T]FE[Q/P/A/S]R[P/V/L]F[F/W/M/S/L][I/L/V/F][Y/S][V/L/A][F/V][A/S]V[D/E]A[E

/D/K/Q/P][A/E]L[D/E/S][F/L]GR[T/S/H/N][S/Y/I/L/A]VDLS[E/Q/L/R]L[I/V][Q/K/R]E

S[I/V/M/T/S][E/D/G][K/R]M[S/N][Q/A/Y][E/Q][G/D][T/L/A/M/E]R[V/L]RQWD[T/M/R

][S/N/A][F/W/L][S/N/G/P/K]L[S/A]GKAKGGEL[V/A/I][L/V]KL[G/S/A]FQIM[E/D][K/

D][E/D/G]G[G/V][I/V/A/G]; or

(ii) any 6 of the motifs listed under (i) ; or

(iii) any 5 of the motifs listed under (i); or

(iv) any 4 of the motifs listed under (i); or

(v) any 3 of the motifs listed under (i); or

(vi) Motifs 1 a, 2, 3b, 4a and 5 as described herein above; or

(vii) Motifs A and Ba as described herein above; or

(viii) any 4 of the motifs 1a, 2, 3b, 4a and 5 as described herein above; or

(ix) Motifs 1a, 2 and 3b as described herein above; or

(x) Motifs 4a and 5 as described herein above; or

(xi) A combination of (vi) and (vii) or (vii) and (ix) or (vii) and (x) above.

The method according to claim 1 or 4, wherein Motif 1 or 1 a is replaced by motif 1*(SEQ ID NO: 46), motif 2 by motif 2* ( SEQ ID NO: 47), motif 3 by motif 3* ( SEQ ID NO: 48), motif 4 by motif 4* ( SEQ ID NO: 49), motif 5 by motif 5* ( SEQ ID NO: 50), motif A by motif A* ( SEQ ID NO: 51) and / or motif B by motif B* ( SEQ ID NO: 52), preferably all of motifs 1 , 1 a, 2, 3, 4, 5, A and B are replaced accordingly.

The method according to claims 1 , 2, 3, 4 or 5 wherein the expression of the nucleic acid encoding a polypeptide is increased by one or more recombinant method(s).

Method according to any of claims 1 to 6, wherein said polypeptide encoded by said nucleic acid is selected from the group consisting of:

(ii) an amino acid sequence having, in increasing order of preference, at Ieast45%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to the amino acid sequence represented by SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2, over the entire length of the sequences represented by SEQ ID NO: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2, and further preferably conferring one or more enhanced yield-related traits relative to control plants.

Method according to any of claim 1 to 7, wherein said increased expression is effected by introducing and expressing in a plant said nucleic acid encoding said polypeptide.

Method according to any of claim 1 to 8, wherein said nucleic acid is selected from the group consisting of:

(ii) the complement of a nucleic acid represented by SEQ ID NO: 1 , 3, 5, 7, 9, 11 ,

13, 15, 17, 19, 21 , 23, 25, 27, 29, 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 ; preferably SEQ ID NO: 1 , 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 , more preferably SEQ ID NO: 1 ;

(iii) a nucleic acid encoding a polypeptide having in increasing order of preference at Ieast45%, 50%, 51 %, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61 %, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71 %, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81 %, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91 %, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to the entire amino acid sequence represented by SEQ ID NO: 2, 4, 6, 8, 10, 12,

14, 16, 18, 20, 22, 24, 26, 28, 30, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, preferably SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 or 72, more preferably SEQ ID NO: 2, and further preferably conferring one or more enhanced yield- related traits relative to control plants; and

Method according to any of claims 1 to 9, wherein said one or more enhanced yield- related traits comprise increased yield relative to control plants, and preferably comprise increased biomass and/or increased seed yield relative to control plants, and preferably comprise increased aboveground biomass, increased below-ground biomass, increased seed yield and/or increased sugar yield relative to control plants.

1 1. A method according to any of claims 1 to 10, wherein said polypeptide is selected from the group consisting of:

a. An acidic protein with an isoelectric point value (pi) of below 7.0;

b. A protein with a content of sulphur containing amino acids of equal to or less than 5 % by number;

c. A protein that comprises or contains at least 30% by number of amino acids with aliphatic side chain; and

d. Any combination of a. to c above. 12. Method according to any one of claims 1 to 1 1 , wherein said one or more enhanced yield-related traits are obtained under non-stress conditions.

13. Method according to any one of claims 1 to 1 1 , wherein said one or more enhanced yield-related traits are obtained under conditions of environmental stress, preferably under conditions of temperature stress, salt stress, nitrogen deficiency and/or drought.

14. Method according to any one of claims 1 to 1 1 , wherein said nucleic acid molecule or said polypeptide, respectively, is of plant origin, preferably from a dicotyledonous plant, further preferably from the family Salicaceae, more preferably from the genus Populus, most preferably from Populus trichocarpa.

15. Method according to any one of claims 1 to 14, wherein said nucleic acid encoding a polypeptide encodes any one of the polypeptides listed in Table A or is a portion of such a nucleic acid, or a nucleic acid capable of hybridising with a complementary se- quence of such a nucleic acid.

16. Method according to any one of claims 1 to 15, wherein said nucleic acid sequence encodes an orthologue or paralogue of any of the polypeptides given in Table A. 17. The method according to any one of claims 1 to 16 wherein the polypeptide is a protein involved in and/or responsible for plastid movement within a plant cell.

18. Method according to any one of claims 1 to 17, wherein said nucleic acid is operably linked to a constitutive promoter of plant origin, preferably to a medium strength con- stitutive promoter of plant origin, more preferably to a GOS2 promoter, most preferably to a GOS2 promoter from rice.

19. An isolated nucleic acid selected from the group consisting of:

a. A nucleic acid of the sequence as disclosed in SEQ ID NO: 1 , 53, 55, 57, 59, 61 , 63, 65, 67, 69 or 71 , preferably SEQ ID NO: 1 ; or

b. A nucleic acid encoding a polypeptide of the sequence disclosed in SEQ ID NO:

2, 54, 56, 58, 60, 62, 64, 66, 68, 70 OR 72, preferably SEQ ID NO: 2.

20. An isolated polypeptide with the sequence of the polypeptide as disclosed in SEQ ID NO: 2, 54, 56, 58, 60, 62, 64, 66, 68, 70 OR 72, preferably SEQ ID NO: 2. 21. Construct comprising:

(i) nucleic acid encoding a polypeptide as defined in any of claims , 3, 4, 5,7, 9, 1 1 and 14 to 17;

(iii) a transcription termination sequence.

22. Construct according to claim 21 wherein the construct is an overexpression construct.

23. Overexpression construct according to claim 22, wherein one of said control sequenc- es is a constitutive promoter, preferably a medium strength constitutive promoter, preferably to a plant promoter, more preferably a GOS2 promoter, most preferably a GOS2 promoter from rice.

24. Plant, plant part or plant cell transformed with a construct according to claim 21 to 23.

25. A host cell, preferably a bacterial host cell, more preferably an Agrobacterium species host cell comprising the construct according to any of claim 21 to 23 or the nucleic acid as defined in claim 1 , 3, 4, 5,7, 9, 1 1 and 14 to 17. 26. Use of a construct according to claim 21 , 22 or 23 in a method for making plants having one or more enhanced yield-related traits, preferably increased yield relative to control plants, and more preferably increased seed yield and/or increased biomass relative to control plants. 27. Method for the production of a transgenic plant having one or more enhanced yield- related traits relative to control plants, preferably increased yield relative to control plants, and more preferably increased seed yield and/or increased biomass relative to control plants, comprising:

(i) introducing and expressing in a plant cell or plant a nucleic acid encoding an polypeptide as defined in any of claims 1 , 3, 4, 5,7, 9, 1 1 and 14 to 17; and

(ii) cultivating said plant cell or plant under conditions promoting plant growth and development.

28. Plant, or part thereof, including seed or plant cell, obtainable by a method according to any one of claims 1 to 18, wherein said plant, plant part or plant cell comprises a recombinant nucleic acid encoding a polypeptide as defined in any of claims 1 , 3, 4, 5, 7, 9, 1 1 and 14 to 17.

29. Transgenic plant having one or more enhanced yield-related traits relative to control plants, preferably increased yield relative to control plants, and more preferably increased seed yield and/or increased biomass, resulting from increased expression of a nucleic acid encoding a polypeptide as defined in any of claims , 3, 4, 5, 7, 9, 1 1 and 14 to 17 or a transgenic plant cell derived from said transgenic plant.

30. Transgenic plant according to any of claims 24, 28 or 29, or a transgenic plant cell derived therefrom, wherein said plant is a crop plant, such as dicot plants like soy- bean, cotton, oilseed rape including canola, beet, sugar beet or alfalfa; or a monocoty- ledonous plant such as sugarcane; or a cereal, such as rice, maize, wheat, barley, millet, rye, triticale, sorghum, emmer, spelt, einkorn, teff, milo or oats.

31. Harvestable part of a plant according to claim 24, 28, 29 or 30 and comprising the construct according to claim 21 , 22 or 23 and / or the nucleic acid according to claim

19 and / or polypeptide of claim 20, wherein said harvestable parts are preferably shoot biomass and/or root biomass and/or seeds.

32. A product derived from a plant according any of claims 24, 28, 29 or 30 and/or from harvestable parts of a plant according to claim 31 , comprising the construct according to claim 21 , 22 or 23 and / or the nucleic acid according to claim 19 and / or polypeptide of claim 20.

33. Use of the nucleic acid encoding a polypeptide of claim 19 or as defined in any of claims 1 , 3, 4, 5,7, 9, 11 and 14 to 17 or the construct of claim 21 , 22, or 23 or the polypeptide of claim 20 or as defined in any of claims 1 , 3, 4, 5,7, 9, 11 and 14 to 17for enhancing one or more yield-related traits in plants relative to control plants under environmental stress conditions and/or non-stress conditions, preferably for increasing yield, and more preferably for increasing seed yield and/or for increasing bi- omass in plants relative to control plants.

34. A method for the production of a product comprising the steps of growing the plants according to any of claims 24, 28, 29 or 30 and producing said product from or by a. said plants; or

b. parts, including seeds, of said plants.

35. Recombinant chromosomal DNA comprising the construct according to claim 21 , 22 or 23. 36. Expression construct according to claim 21 , 22 or 23 or recombinant chromosomal DNA according to claim 35 comprised in a plant cell.

37. A transgenic pollen grain comprising the construct according to claim 21 , 22 or 23.

38. A composition comprising the recombinant chromosomal DNA of claim 35 and/or the construct of any of claims 21 to 23, and a host cell, preferably a plant cell, wherein the recombinant chromosomal DNA and/or the construct are comprised within the host cell.